下列各句中，没有语病、句意明确的一句是

After a long _____, the bill was passed by the House of the Commons.

________ is known to everybody, Taiwan is a part of China. We must unify it.

There is still a copy of the book in the library.Will you go and borrow_____—No，I’d rather buy_____in the bookstore.

15 The teacher spoke____of Tom, because he is the only student who can fly the kite in the sky