20．He said he would accept the job, so we have asked him to __________ his acceptance in writing.

A．confirm　 　　　　 B．prove　 　　　　　　　 C．sign　 　　　　　　　　 D．announce　

19．When she was in trouble, I did what I could to help her. __________ my help, she wrote me a letter of thanks.

A．In honor of　 　 B．In case of　 　　　　 C．In terms of　 　　　 D．In return for

18．With the evening drawing near, the guide __________ tourists and took them to the hotel.

A．rounded up　 　　 B．made up　 　　　　　　 C．fed up　 　　　　　　　 D．put up

17．Winners,according to the rules, will be offered a three-day holiday to Singapore, __________.

A．paying all expenses　 　　　　　　　　　　　　　 B．paid all expenses　

C．to pay all expenses　 　　　　　　　　　　　　　　 D．all expenses paid

16．Pleasant as they made it __________ , we felt tired after the long journey.

A．to travel　 　　　　　 B．traveling　 　　　　　　 C．by traveling　 　　　　 D．for travel