Air pollution is getting more and more serious, so we must take action ________ it is too late.
| A．before | B．after |
| C．until | D．when |
Sorry, sir, but you can’t go any further without______boarding pass. Please obey ____ rule.
| A．the; the | B．a; a | C．a; the | D．the; a |
Eyes ________, I see the moon so bright; Head ________, in homesickness I am drowned.
| A．raising; bending | B．raising; bent |
| C．raised; bending | D．raised; bent |
The shoes are of high quality and ________ long.
| A．wore | B．are worn | C．wear | D．will be worn |
--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
--________ my students have a try?
| A．Should | B．Shall | C．Will | D．May |
--How much salt did you put in the soup?
--I’m sorry to say, ________. I forget.
| A．no | B．no one | C．nothing | D．none |