21. You may use my office as you like,        you clean it up afterwards.

   A. as if                   B. as well as                 C. as soon as                 D. so long as

22. —Mike, what did our monitor say just now?

   —Every boy and every girl as well as the teachers who    to visit the museum     asked to be at the school gate before 6:30 in the morning.

   A. is; is                   B. are; are                    C. is; are                      D. are; is

23. I would like Tom to go with us, but Tom insisted       at home.

   A. that he stay         B. that he says               C. staying                     D. to stay