17.This kind of car is a__________ on TV every day. You can easily find out its description and the price you want.

16.Before the Civil War in America, Negroes were s__________.

15.London will _________ (主办) the 30^th Olympic Games.

14.The man __________ (承认) that he murdered a little girl and may be sentenced to death.

13.You should _________ (保证) not to lend it to others if you want to use it.

12.This kind of change is called ___________ (物理) change.

11.How many ___________ (奖牌) did China get in the 28^th Olympic Games?

10.They have worked very hared and _______ to pass the exams.

　　 A worth　　 B deserve　 C serve　　 D　 pay