1 . We apologize for the delay and regret any __________ (convenient) it may have caused.

2 . They hid the money for fear that __________ (thief) should break in.

3 . The tallest buildings in London are small in______(compare) with New York’s skyscrapers. (所给词的适当形式填空)

4 . With key ______in this field, the company gains an advantage over other companies. (突破)

5 . Her speech was greeted with thunderous ______.(掌声)

6 . His son had an obsessive drive to gain his father's ______ (赞成).

7 . A major problem of this area is the ________(缺乏) of water.