2.　　　 The children are encouraged to be _________________________ (独立).

根据下列句子及所给汉语注释，在句子右边的横线上，写出空缺处各单词的正确形式．(每空只写一词)

1.　　　 She prefers pop music to ____________________ (古典的)music.

50. He made up an excuse when _________ why he didn’t turn up at the meeting.

A. questioned　　 B. questioning　　 C. to be questioned　 D. being questioned

49. Don’t panic; just _________ that rock and I’ll fetch you down.

A. hold on to　　 B. Come up with　 C. go ahead with　　 D. give in to

48. China is increasingly short of natural resources, including natural gas and other forms of ________ .

　 A. material　　　 B. energy　　　　 C. power　　　　　 D. source