What a pity! Considering his ability and experience, he better.need have done B.must have done C.can have done D.might have done
_______ , athletes from all over the world compete _______ the Olympic Games _______ the honor of winning.
Teenagers shouldn’t be _______ from school although they don’t do well in their studies.
--- Look! Everything here is under construction. --- What’s the pretty small house that _______ for?
In our class there are 46 students, _______ half wear glasses.
Mr. Thomas is ______ a teacher to us. We look on him as our friend.