I'd definitely use the (a)

Are you sure it's jumped to the rescue? I feel that jumped to the conclusion would fit better. Taking "jumped to the rescue" in this context, I'd take it to mean the scientists created a reason that could be supported with the evidence.

Best Friend

My best friend is Luis, he's 21 years old and studies natural resources. We met in my English class this year. He's like a brother for to me; he is a fun person and always knows when to(or how to) keep a secret. This course was incredible, because I had his support, but the next year he won't take the classes with me. I'm feeling sad for this reason, because I want to see him every day because I love talking with him and probably I won't can see him as often****, because we're will be very busy with the University     ??    .

***I used "as often" because I prefer to have that comparison to when you were feeling happier having his support. 

?? - not sure what about what influence the  University has on your time, so specify whether it's classes or some sort of research.   

I can say that I like the game but the community is very toxic. I do play though :P

Pretty sure it has to deal with the Germanic languages in general and their Latin roots, along with the power of the English speaking countries.

A special football match

As is depicted in the picture above, a “football match” of taking care of the old father is going on. The oldest son firstly exerts all his strength to kick away his father, who is crouching in the middle of the football field, while the other children, all are preparing to defend the goal in case their poor father get in.
What an thought-provoking social phenomenon!

What the picture illustrates ed  is a prevailing phenomenon existing in current society, that is the young are not willing to assume their responsibility of supporting their elderly parents. Furthermore, it is precisely this kind of immoral conduct that leads to such an fact situations—while they enjoy a comfortable life, their parents live leaning relying (personal preference: leaning does work but i feel relying flows a bit better in the sentence) on poor allowances, without any assurance .

Consequently, it is of great significance for the government to take some drastic measures to reverse this disturbing trend and awaken people’s awareness (personal preference: "awaken people's awareness" can be replaced with "enlighten people" that taking the responsibility of taking caring of for their parents is part and parcel (not sure what this meaning is that you are intending however I would infer that you wish to state it's deemed necessary if not expected) morally just and necessary in their lives. Only in this way can we curb the current phenomenon revealed in the cartoon.

Bookreview

I was writing a bookreview for my English class and i need your help...

I Am Not A Serial Killer by Dan Wells tells the story about John Wayne Cleaver, he’s 15 years old and whom lives and works with his mother at a mortuary. He has been diagnosed with antisocial behavior, this means that … John will be a serial killer in the future;. he tries to be normal but he isn’t; because he hasn't does not have feelings and he want to hurt toward others, including his family. so For this reason he has a rules for to control his actions, because John knows that he’s destined to become a serial killer.

But the things changes to John when in Clayton appears a Serial Killer, so… John throws his rules to the trash, because he wantsna knows who is the serial killer,. This obsession changes his mind and starts the game for him. The Clayton’s murderer has a different patrons victims than others killers, and John doesn't know for why what reason, so…this is a like playing a game for him and he’s acting like a FBI agent. but he has a reason, He wants to kill the serial killer, but he doesn’t know who is the murderer is.

The killer is more near closer than he imagined, but when he recognizes the killer serial (swap to serial killer) intentions it is too late. John lost so many things for his fails *** in pursuit of the investigation, but now he knows who and what is the killer; The murderer is a demon and John tries to kill/murder the killer/murderer. ( I'd alternate kill/murder otherwise it sounds a bit funny so kills the murderer or murders the killer would work better in my opinion)

***(unsure what you wish to say regarding failure. If you are trying to say the investigation was a failure I'd word it as "John lost many things during the investigation which I deem as a failure" However, I think you are implying he lost things because of his own personal failures in which case "John's shortcomings caused him to lose many things during the investigation". 

But the things didn't end to for John…*** concluding statement is a bit confusing, from what I infer from previous paragraph John ends up succeeding in killing the killer so I'd state that) 

大家好。

大家好，最近我开始准备汉语的考试啊！
在这个周末，我有hsk考试啊。
其实，我没努力学习，也我没有时间多。
所以，我从今天我要练习汉语的写字（characters?)。
即使我失败这次的考试，我没关系。
我要再考试下次 去。
请大家，帮助我的汉语。
我也要努力学习吧，也我我也可以帮助你的韩国语。
请多多关照！
大家，小心感冒！再见！