49. Housing in this city is very _______________ (costing a lot of money).

48. Mr Black started to become ____________ (unable to see) in his sixties.

47. China is more and more important among ______________ (亚洲的) countries.

A. 请根据句意、括号中的中文提示或英文释义，写出句中所缺单词，使句子通顺。　

46. It is said that we will be _____________ (分开) into six groups.

15.(　 ) -Did you have a good weekend?

-_________. I enjoyed myself with my family on the beach．

A. I’m afraid not　　 　 B. I’m not sure　　 C. Of course　　 　 D. I hope so