—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do thejob?—____ my students have a try?
_______, I’d have told you.
20. He reads newspapers every day to keep himself_______about what's going on in the world.
We_______such great progress without your efforts. Thanks a lot.
Our success was largel_______the good cooperation of all team members.
For a long time they walked without saying _________ word. Mike was the first to break __________ silence.