39.The robot “teacher” was talking with his students as though it ()a human teacher.

35.People who won’t work should be made ().

34.The teacher said that the earth ()around the sun.

33.Ever since the family moved to the suburbs last year， they ()better health.

32.Had he worked harder， he ()the exams.

31.If I ()harder at school， I would be sitting in a comfortable office now.

50.Humble ()it may be， there is no place like home.

49.It is high time that the international community ()together to fight against terrorism.

48.It wasn’t until nearly a month later ()I received the manager’s reply.

47.Scarcely ()when the murderer shot him down.

46.He is the only one of the students who ()a winner of scholarship for three
years.