These 3 words happens in different scenes. 没关系:(formal or not very informal). when someone do a wrong thing, but it is not influence to you, when he say sorry to you :“对不起", the only answer is "没关系"！ Of course, if it is a major accident, such as car accident, you get injured, when the driver say sorry to you, you don't need say anything. 不要紧：(not very formal and informal). means don't worry about me. (when someone concerned about you) You get fever in your company, someone worry aout you,"How about you?""Are you OK?" you should say "我不要紧", means I'm OK. or Not very bad, I can continue working. A borrowed a book from B, and promise to give back in 3 days. but the date delay. after 5 days, A say"I'm so sorry." you shold say:"不要紧" means never mind. sililar to "没关系" 无所谓：(formal and informal) means "I don't mind something". A,B,C, three people in a room. A says to B"C is smoking now", B replys"无所谓"means B don't mind. There are 10 people in my familly. I'm host. I give each one an apple. You get the smallest apple. At this time, if one people say"your apple is the smallest!". you don't want to embrassed the host, so you say无所谓，都一样.means I don't mind bigger or smaller. But, at this time, If I say "Sorry to give you the smallest one", you should say"不要紧,小的说不定更甜呢。"means you don't mind it is the smallest one. For not embarrased the host, you can say"the smallest one is the sweetest one."

Just like to face to your sister (or mum). You quarrelled with your sister (or mum), but she will be your sister (or mum) forever. You have never worried about how to face to your sister (or mum), don't you? So, take it easy, my friend, your exgirlfriend is just one of your best friends in your life. You should face to her frankly and honestly.

1 have a feast 2 travel 3 play on-line games 4 sports 5 chat with your boss 6 chat with your freinds 7 see a phsycologist. If you have a light pressure, chatting or sports or travelling is a good choice. If your pressrue is heavy, phsycologist is the only choice.

All that inetersting? Spare time is limited! It's impossible to do so many things. I think if you always want to do so many interesting things, you will always feel have no time, and nothing will be done better. So I suggest you choose one of your best favourate things to do, I believe you will do it better. Atfer a long time, you could consider to do the next your favourite thing. I think do each your favourite thing one by one is better than do all things at the same time.

They are synomy. As a native Chinese speaker, I never think their difference. In generallly, you can use each one as you like. "还是": It is informal. It always appears in speaking. It's often used in chatting. "仍然": It's between formal and informal. "依然" It's formal.

我喜欢看外国朋友写的他们国家的生活状况，人，事。比如从小是怎么上学的，每天几节课，都学些什么，父母怎么教育孩子，天天吃些什么，玩些什么，找工作难不难，社会福利好不好。 然后再写中国的所见所闻。每天发生了什么事，怎样认识的新朋友，适应中国的生活吗？觉得什么好？什么不好？喜欢吃中国菜吗？有什么有趣的事发生？再配上照片（用手机随机的拍）。我想一定会很有趣。

If you are not in China, you can find Chinese friends by skype, msn. We often use msn, and QQ(OICQ), a software likes msn. Or you can find some Chinese who are in Japan. You can chatting with them, and learning each other.