I feel sure that ______ qualification, ability and experience, our headmaster is abundantly equal to the position we have in mind

do you choose to work in an international travel agency— Well, you know, English is my ____________. So it is my best choice.

We laugh at jokes，but seldom____________about how they work．

I don’t understand why the boss should __________ thegirl, because in my opinion, it was her fault that caused the loss.

I don’t think I’ll be able to go mountain-climbing tomorrow. —_________