The U. S．declares it has the best medical technology in the world，but quite a lot of Americans have no ____to health care service．
| A．devotion | B．entrance | C．access | D．introduction |
——I’d like to book a flight to Shanghai, please.
——____________.
| A．No, of course not | B．Do you mind if I said no? |
| C．Yes, sir, single or return? | D．You can’t. We are busy |
——May I smoke here?
——If you , choose a seat in the smoking section.
| A．should | B．could | C．must | D．may |
Thank you for helping me. I the final exam without your timely help.
| A．have failed | B．will fail | C．would have failed | D．must have failed |
——Has Tom finished his report so far?
——I have no idea. He it this morning.
| A．did | B．has done | C．was doing | D．had done |
He is a little bit mysterious these days. Nobody in our company knows exactly.
| A．what he is working on | B．what is he working on |
| C．what did he work on | D．what was he working on |