Experts warn that medical waste from hospitals, if properly, may contribute to spreading diseases.
| A．not handled | B．not being handled |
| C．not to be handled | D．not having been handled |
I wish I ___ able to tell him all about it last night.
| A．should be | B． were | C． had been | D． was |
The students ages ____ 15 to 18.
| A．range | B．ranged | C．range from | D．ranges from |
Only when your identity has been checked ____________.
| A．you are allowed in | B．you’ll be allowed in |
| C．will you allow in | D．will you be allowed in |
The speech by the mayor of Shanghai before the final voting for EXPO 2010 is strongly impressed ___ my memory.
| A．to | B．over | C．by | D．on |
Having never met with such a _____ problem, he felt _____ and didn’t know how to solve it.
| A．puzzling; puzzled | B．puzzled; puzzling |
| C．puzzling; puzzling | D．puzzled; puzzled |