1.It's good 【for】 you to take a walk in the fresh air every morning
2.The emperor thought that he had nothing to worry 【about】
3.I heard him 【sing】 two songs at the party
4.It's my honor to 【be sent】 here to work with you
5.They considered 【it】 their duty to make their patients happy
6.She set out 【to make】 the dress by herself ,but in the end she had to ask for help
7.The Pudong new area is said to 【have changed】a lot since 1995
8.He likes listening to others 【discuss 】things
9.He doesn't 【swim】as often as he used
10.The boy was seen 【to take】 the bag and 【run】 away
11.They are waiting 【to see】the doctor
12.You ought to 【have finished】 this exercise yesterday
13.Why not 【ask】 your teacher for help
14.The little boy hardly knew 【how】to read or write
15.Would you please not 【make】 nay noise