49.　 Don’t _________　 _________(扔掉) those rotten vegetables; we can feed them to the pigs.

48.　 If you are trying to go to college you ____________　 ____________(应该) study harder.

47.　 The __________(研究) indicates that men find it easier to give up smoking than women.

46.　 She ___________(叹气) when she saw the hole in her blouse.

45.　 When he went to England, he found his English was too __________(有限的), so she began to learn English.

44.　 If you want to sell your house, you can put an a___________ in the local newspaper.

43.　 The union was formed to p___________ the rights and interests of miners.

42.　 The two major political parties have c___________ to form a government.

41.　 Will you weigh it in the b___________?

40.　 He is d___________ to give up smoking.