It is 30 years ______ China performed the Reform and Opening-up policy ______ has had a great effect not just on China, but also on the world.
| A．that; since | B．since; 不填 | C．when; that | D．since; that |
—Are you going to watch the game？
—I'm sure _____ ,for it promises to be a close one.
| A．so | B．I will | C．not | D．I won't |
—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 |