54．格林一家此刻正在参加时装表演吗?

　　　　　　　　　　 ▲　　　　　　　　　　　 at the moment?

53. -Has the teacher finished marking the exam papers?

-Sorry, I don’t know. He　　 ▲　　 (mark) them in the office yesterday afternoon.

52. -What’s his plan after he leaves school?

-He　　 ▲　　 (go) to Beijing for further education.

51. You mustn’t touch the machines unless you　　 ▲　　 (allow) to.

50. We’ve worked for a long time. Let’s stop　　 ▲　　 (drink) some water.

49. Since he fell off the bike, John　　 ▲　　 (lie) in bed for nearly a week.

48. He seldom　　 ▲　　 (回复) to the e-mails his friends send him.

47. The dresses　　 ▲　　 (本身) are made of common materials, but they sell well because of the famous designer.

46. Kids　　 ▲　　 (低于) 5 years old can’t play with this kind of toy.

45. After Jim answered the phone, he rushed out of the house　　 ▲　　 (立即).