1 . 词性转换
1. believe v.相信；认为→________________adj.可信的→_________________adj.难以置信的
2. breath n.气息；呼吸→____________________adj.气喘吁吁的；呼吸急促的
3. calculate v.计算；核算→____________________n.计算
4. care n.小心；谨慎→____________________adj.小心的；仔细的→____________________adj.不小心的；粗心的→____________________n.粗心；疏忽
5. celebrate v.庆祝→____________________n.庆祝；庆祝会
6. centre n.中心点；中心→____________________adj.中央的；中心的
7. certain adj.确实的；有把握的→____________________adj.不确定的→____________________adv.无疑；确定；当然
8. change v.改变；变化→____________________n.零钱；改变→____________________adj.可能变化的
9. character n. 品质；特点→____________________adj. 典型的；独特的
10. cheer v.欢呼；喝彩→____________________adj.快乐的；高兴的

2 . 词性转换
1. announce v.宣布→____________________n.通告；公告；宣布
2. apply v.申请；应用→____________________n.申请人→____________________n. 申请（书）；应用
3. appoint v.任命；委任→____________________n.约会；约定
4. appreciate v.感激；欣赏→____________________n.感激；欣赏
5. approve v.赞成；批准→____________________n.赞成；批准
6. argue v.争论；争吵→____________________n.争辩
7. arrange v.安排；筹划→____________________n.安排；筹划
8. attract v.吸引；引起→____________________n.吸引力；喜爱→____________________adj.迷人的；有吸引力的
9. bear v.忍受；忍耐→____________________adj.可忍受的→____________________adj.难以忍受的；无法容忍的
10. beauty n.美丽→____________________adj.美丽的

3 . ________ she couldn’t understand was ________ fewer and fewer students showed interest in her lessons.

A．What；why

B．That；what

C．What；because

D．Why；that