Dr Yuan Longping grows _____ is called super hybrid rice, _____ has a high output.
| A．what; which | B．that; what |
| C．that; which | D．what; that |
I've always been very about giving my address to strangers．
| A．familiar | B．excited | C．cautious | D．concerned |
If you let challenges and difficulties benefit depress you, much more can be accomplished than you thought possible．
| A．more than | B．rather than | C．less than | D．other than |
Occasions are quite rare the father has the time to spend a day with his kids．
| A．when | B．which | C．why | D．that |
—How's the public transportation in the city?
—It's very convenient, so there be any difficulty in travelling around．
| A．wouldn't | B．shouldn't | C．mustn't | D．needn't |
__________satisfies the teacher is the naughty boy is making progress in all his subjects．
| A．That; that | B．That; what | C．What; what | D．What; that |