1 . She always has her head ___________(埋) in a book.(根据汉语提示单词拼写)

2 . The scenery was so beautiful that it was almost _________ description.（用适当的单词填空）

3 . They didn't go camping __________it rained heavily.

A．because

B．and

C．so

D．or

4 . Chemical weapons ___(ban) internationally because of the massive destruction to people and the earth. (所给词的适当形式填空)

5 . English is the most widely used among the _________(branch) of Germanic family of language. (所给词的适当形式填空)

6 . David still works hard ________ he has made great progress.

A．because

B．though

C．unless

D．if

7 . Jack, you look so tired. You should keep a ________ between your studies and relaxation.

A．promise

B．secret

C．balance

D．diary

8 . _________ (平衡) a scientific career and a family takes time and effort but is not impossible.

9 . A balanced diet is ___________(有益的) to our health.

10 . Her mother praised her good ________ (behave) in front of the guests. （所给单词适当形式填空）