作业,求帮忙.谢谢亲一、单选题（共 50 道试题,共 100 分.）47. – Can you tell me how

作业,求帮忙.谢谢亲
一、单选题（共 50 道试题,共 100 分.）
47. – Can you tell me how much a radio like this costs? – ().
A.I'd like to buy it
B.It's of very good quality
C.About eighty-five dollars
D.It depends on how you like it
48. If you go by car, you'll get there( )40 minutes.
A.within
B.about
C.under
D.after
49. I( )finish my homework now. I can do it at the weekend.
A.have to
B.don't have to
C.must
D.mustn't
50. You should make( )your house or flat is secure.
A.sure
B.certain
C.understanding
D.knowledge