我在幾年前看過一部俄羅斯電影《zhit》（中文譯名：活著）非常震撼。這部關於愛和信仰的電影，把社會的黑暗和冷漠呈現到極致。以至於後來我在東德生活，看到蘇聯時期留下的建築，會因聯想到那部電影而無法呼吸。

Haha.. I cannot help but laugh.. 

慢 (slow) 跑 (run)

“Jogging” here is not a type of sport :)

It jogs my memory: 它帮助我记忆(it helps me to remember something)

Btw, there is self-effacement in Chinese culture. 研究(research) is kind of academic. So if you use this word, it indicates you’re an expert/researcher. 学习 is more appropriate for ordinary people.

Continuing my Chinese studies

我写得对吗?

2. 他正在听着音乐骑自行车，他很不注意安全！

— 他听着音乐骑自行车: He listened to music while he was riding a bike.

‘骑自行车’ is a primary action in this sentence. If you want to describe another action at the same time, you should add ‘着’ behind the action.

— ‘不小心’ is an adv. It usually means ‘accidentally’

他不小心摔了: He fell down accidentally.

— ‘不注意安全‘ means someone do not care about his safety.

3. 在美国工作被做完了，他正在回国。

— if you want to use ‘被‘, it would be better to explain that the job was done BY WHOM.

— 他正在回: he is coming back.

—他回了: he came back.

4. 服务员说着“欢迎”给我们新的菜单。

I don’t think this sentence is incorrect. But please notice the punctuation. 《》is only used for a book’s name.

5. 我觉得她正在世界上旅游，没有？

The sentence is correct, but the meaning is weird. ‘世界上‘ means ‘be in the world’ (be, exist). You might mean to say ‘ around the world’, which you can use ‘周游世界‘

— 我觉得她正在周游世界，不是吗？

I think she is traveling around the world, isn’t she?

今天晚上我在外面看到很多孩子，他们想要糖果，因为今天是万圣节。但是，有些人不开了门，我认为他们不喜欢万圣节。可是我觉得孩子仍然开心的。

You need a preposition ‘在‘ in front of the position.

Please notice the difference between the following sentences:

开不了门- because of some reasons, the door can not be opened

不开门了- the door is closed (won’t open any more)

不开了门- （it’s weird Chinese ）

门不开了- the door won’t be opened 

when you want to use adjective, 的 and 是 are always together:

孩子仍然是开心的。