It seems the boy knew everything, though in fact he does not. [ ]

ilding _____ in our school isfor us teachers Though there’s noise most of day, we still feel happy about it

The maths teacher demanded that all the students _______ the examination paper within one and a half hours.

Though there are some differences in American and Chinese education，both systems are__________excellent graduates.

30．— What’s the trouble with you, Andy? — I want to find another firm. Whatever I do, I can’t ________ the boss now.