--- He worked out such different questions at a very young age.
--- Oh, he ______ a very smart student then.
| A．could have been | B．should have been |
| C．might have been | D．must have been |
Only when something gets lost _____________.
| A．can you realize how important it is to you |
| B．how important you can realize it is to you |
| C．you can realize how important it is to you |
| D．can you realize how important is it to you |
She’s developing into someone who’s going to become very poor and require ______.
| A．looked after | B．being looked after |
| C．looking after | D．to look after |
With more forests being destroyed, huge quantities of good earth _______ each year.
| A．is washing away | B．is being washed away |
| C．are being washed away | D．are washing away |
This event not only raised _______ of world hunger, but also raised lots of money to help starving children.
| A．information | B．knowledge | C．instruction | D．awareness |
____________ you may be right, I can’t altogether agree.
| A．While | B．As | C．If | D．Since |