23.　 Having warned/Having been warned about the mice, he didn’t leave the food at the place they could easily reach.

22.　 She asked me to help her, realized/realizing that she couldn’t move the heavy desk alone.

21.　 They had to work in temperature near/approaching 37.

20.　 As to the subject, we have consulted(请教) the most learned/learnt professor.

19.　 If you’re on a diet, there are some foods you have to avoid/lack.

18.　 The policeman regretted not taking attention/action as soon as possible at the alarm.

17.　 Having waited/Have waited in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

16.　 With a lot of difficult problems to settle/settling, the newly-elected presidents is having a hard time.

15.　 He sent me an e-mail, hoped/hoping to get a job in my school.

14.　 She is downstairs wrote/writing letters.