1. It may be necessary to stop__________________________(每隔...時(shí)間) in the learning process and go back to the difficult points in the lessons.

　　2. The mad man was put in the soft-padded cell lest he ______________(傷害自己).

　　3.Jean did not have time to go to the concert last night because she was_______________(忙著準(zhǔn)備) her examination.

　　4. The ship's generator broke down and the pumps____________________(不得不用手工操作) instead of mechanically.

　　5. Why didn't you tell me you could me the money? I___________________________ (本來不必從銀行借錢的).

來源:可可英語 http://www.ccdyzl.cn/cet6/201308/254547.shtml