Of the two physics problems， Martha just finished ______ one．（ ）
A．the most difficultB．the least difficult
C．the less difficult
My neighbor asked me I heard the big noise last night or not．（ ）
A．whetherB．ifC．what
invite Tom and Sally to the party tonight？
Good idea．I'll give them a call right now．（ ）
A．WhyB．Why notC．What about
I have two tickets for TF boys' concert． you ___ he can go with me．（ ）
A．Either； orB．Neither； nor
C．Both； and
Bob is a smart boss!
Yes，so he is．He knows how to cut the cost of the project．And he always does the work with money and people．（ ）
A．less； lessB．fewer； less
C．less； fewer
Mom， I visit the Science Museum tomorrow？
I'm afraid you can't．It is closed on Monday．（ ）
A．mustB．mayC．should