用所给词的适当形式填空。每词限用一次。
pull down, use , afford , shop, read
【小题1】The old buildings must ____________ because they are very dangerous.
【小题2】There ____________ to be two libraries in our city，usedn't there?
【小题3】They have run out of their money , so they can't ____________ to take a taxi.
【小题4】We should take our own bags when ____________ .
【小题5】____________ you ____________ this book yet?