13.　 If you think what he sings is wonderful, please a_______(鼓掌).

12.　 His success e______(存在) in his intelligence and his way of studies.

11.　 The students sat in s_______ because none of them knew how to answer the question.

10.　 The boy was s________ from a fever, so he had to go to see a doctor.

9.　　 The teacher is writing something on the blackboard with a piece of c______.

8.　　 C_____(小丑) often make people laugh.

7.　　 Though John Smith has lived in Beijing for almost ten years, he still speaks Chinese with an English a______.

6.　　 Please read the d_________ carefully before you begin to use the machine.

5.　　 Three beautiful girls are dancing on the s______ before the audience.

4.　　 She said she a_________(感激) my help. A______, I don’t think I have done much for her.