21. A: --- Are you coming to Jim’s birthday party ? ( )
B: --- I’m not sure. I ________ go to the concert instead.
A. should B. would C. must D. might
22. There is no doubt ______he will come to our party. ( )
A. that B. if C. whether D. what
23. The tower of London is ___ the church tower. （ ）
A. twice high tha n B. two times as high as
C. twice higher as D. three times the height of
