What's the difference between "believe"and "believe in"?

It is said that Engliah is the easiest language in the world.What do you think?

 It is said that Engliah is the easiest language in the world and Chinese is the most difficult one.So what do you think?

Have you ever come to China?

Have you ever come to China? If you have,where have you gone?

Why do I feel sleepy every morning? I usually get up early everyday, but I always feel sleepy.I usually get up early everyday, but I always feel sleepy then.

Introduce sth about USA to me

I'm very interested in USA, I want to know the culture, the life the native living and so on.

What are the differences between the two Invoices? I really wanna to know the differences between " Commercial Invoice " and " Pro Forma Invoice " . Thank you in advance!

Going to the USA oneday is my dream When I was a little girl that didn't know anything, I heard a beautiful voice from the television occasionally, I smiled, someone told me that it was English, I knew I've fell in love with it since then. The first time that I learned English was in my primary school, but at that time I thought it was a little difficult to me. After going to the junior school, I began to learn it well. The keys to learn it well were interest and perserverance. I majored in Business English when I went to university. Now I'm about to end my college career, but I can't stop learning English, cause I know that knowledge is infinite and I need to improve my oral English. The best way to ascend oral English is to go to the native place to live the local life, so USA is the best choice. Even though I have time, I have many limitations such as money. So going to the USA is becoming my dream. I hope that my dream will come true oneday!

Summer Is Here I'm in China. It is nearly July already,and it's so hot here in summer. I can't even bear the high temperatures,though we have air-conditions now.Cause the high temprerature,I don't want to eat,and I don't want to go outside,or I even don't want to work,I just want be stay on bed without any move.I was sleepy and weak,but I have to work,I wouldn't be irresponsible,so that's the question here. Why is it so hot here in summer?