In the Warring States period， Mozi made the kite in history out of wood． （第一 ）
在去年的夏令营活动中，营员们彼此和睦相处．
In the summer camp last year，all the members ．
这部纪录片有助于我们近距离观察美国的学校生活．
This documentary helps us the school life in America．
You can't imagine what difficulty I had （express） myself clearly at the beginning．
The engineer （try） every possible way，but still cannot get the computer started．
Hi，Judy．Have you graduated from college？
Yes．I （study）in Nanjing University for four years．