---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
A. must be playing B. must have played
C. may be playing D. may have played
In our class there are 60 students, of ____________ two thirds are boys.
A. which B. them C. whom D. who
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
A. on B. by C. in D. through
I hated it when people don’t ___________ their promises.
A. carry out B. look out C. run out D. find out
________ hard he tried, he could not change his wife’s mind.
A. However B. Whatever C. As D. No matter what
------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
A. may have checked B. might check
C. must have checked D. should have checked
