I’ll spend the evening ______ in your room waiting for the thief to arrive.
| A．locking | B．in locking | C．being locked | D．locked |
—The problem isn't difficult for the children to work out, is it？
—_____ . Perhaps they should have been given a more difficult one.
| A．Yes, it is | B．Yes, it isn't | C．No, it is | D．No, it isn't |
—Shall I tell John about it？
—No, you _____ ,I've told him already.
| A．needn't | B．won't | C．mustn't | D．shouldn't |
_____ is known to all, paper was first made in China.
| A．It | B．That | C．Which | D．As |
We worked all night, _____ for the coming procession.
| A．to prepare | B．preparing | C．prepared | D．was preparing |
—It's a lovely day, isn’t it？
—_____ ？
| A．Yes, it is | B．Yes, is it | C．Yes, isn’t it | D．No, isn’t it |