24．It is a rule in our school that no books______out unless you have a library card.

Jenny, I’ve finished my summer school classes—Well, Chinese is _______ difficult to learn, isn’t it?—It seemed that _______ at first But after a while it starts to get easier I got an A in the exam

Not only ______ strict with us, but also ______ for us .

rang you several times yesterday but couldn’t____.

Some experts argue that the reason why the price ofhouses can’t drop is that the supply is not ______ to the demand.