21.　　 When _____ help, one often says “Thank you!” or “It’s kind of you.”

A. offering　 　B. to offer　 　　C. to be offered　 　D. offered

20.　　 ---Can the project be finished as planned?

---Sure, ________ it completed in time, we’ll work tow more hours a day.

A. having got　　 B. to get　 　　C. getting　 　　D. get

19.　　 He hurried to the station only _______ that train had left.

A. to find　 　B. finding　 　　C. found　 　　D. to have found

18.　　 He glanced over at her, ____ that though she was tiny, she seemed very well put together.

A. noting　 　　B. note　 　　C. to note　 　　D. having noted

17.　　 ---What should I do with this passage?

---______ the main idea of each paragraph.

A. Find out　 　B. Found out　 　　C. Find out　 　　D. To find out

16.　　 At last, we found ourselves in a pleasant park with trees providing shade ________ down to eat our picnic lunch.

A. sitting　 　　B. having sat　　 　C. to sit　 　　D. sat

15.　　 More and more people are signing up for Yoga classes nowadays, _____ advantage of the health and relaxation benefits.

A. taking　 　　B. taken　　 　　C. having taken　　 　D. having been taken

14.　　 It was unbelievable that the fans waited outside the gym for three hours just ______ a look at the sports stars.

13.　　 _________ into use in April 2000, the hot line was meant for residents reporting water and heating supply breakdowns.

A. Put　　 　B. Putting　 　　C. Having put　 　D. Being put

12.　　 He got well-prepared for the job interview, for he couldn’t risk _____the good opportunity.

A. to lose　 　　B. losing　 　　C. to be lost　　 　D. being lost