题目内容：

用方框中所给短语的适当形式填空:

1.Jay Chou ____________________ music and has written and sung a lot of popular songs such as Blue and White Porcelain《青花瓷》and East Wind Broken《东风破》.

2.Studies show that people ____________________ suffer from back problems if they always sit before computer screens for long hours.

3.____________________, senior school students should take part in all kinds of after-school

activities in their spare time.

4. It is essential for students to ____________________ classes at school.

5. Oliver Twist __________ child poverty _______________ the public, and for this reason alone it is a very important novel.

6.Shocked by the scene, the warden who was strong and healthy had to ____________________ the wall for support.

7.It is the protection for the trees that really matters, ___________________ how many trees are planted every year.

8.There is a widely held belief that the tourism is ____________________because of the economic recession（衰退）.

9.China is working ____________________ the other countries in international affairs.

10.China ____________________ the giant panda.