--- It’s reported that vaccines(疫苗) for H7N9 bird flu may hit the market as early as May.
--- Really? If so, we _____ depend on those from abroad.
| A．mustn’t | B．can’t | C．shouldn’t | D．needn’t |
—Would you likecamping with me?
—I’d like to. But I’m busymy homework.
| A．to go; to do | B．to go; doing |
| C．going; to do | D．going; doing |
Most students like the teachersunderstand them well.
| A．which | B．who |
| C．where | D．when |
—It’s difficult to get to the other side of the river.
—I think a bridgeover the river.
| A．should be built | B．should build |
| C．will build | D．has built |
Li Na is famous all the tennis fans in China know her.
| A．too; to | B．enough; to |
| C．as; as | D．so; that |
More and more people have a low-C life and the air is getting much ___ than a few years ago.
| A．clean | B．cleanest |
| C．cleaner | D．the cleanest |