6. fiftieth　　　 7. customers　　 8 struggling　　　 9. .especially 10.exposed

10.He dived into the water, leaving only his face _________(裸露)　　　 　　　　　　10.____________

Keys: 1. favorite　　　 2.apologize　　　 3. understood　　　 4. easier　　 5. comfortable

9. The students in our school study very hard, ___________(尤其) those in our class. 　　9.____________

8. When I came to the riverside, I found a boy __________(挣扎) in the water. 　　　　8.____________

7. The assistant is very friendly to all the __________(顾客).　　　　　 7.____________

6. A great celebration was held on his _________(50岁)birthday.　 　　　　6. ____________

5. I think you can sit on this newly bought chair very c__________.　　 　5.____________

4. ---This problem is not difficult.　 --- But that one is even e__________.　 4.____________

3. Please speak as loud as you can to make yourself u__________.　　 　　3.____________

2. If you knock into somebody, you should a__________ to him.　　　 　2.____________