-- What will the weather be like tomorrow? -- It ______ be rainy, cloudy or sunny. Who knows?

I ______have come here in time, but I met an old friend of mine. I stopped and talked with him for some time.

The police still haven’t found the lost child, but they’re doing all they             .

—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—________ my students have a try?

—I want to know if I _______________smoke here. —No, you ______________. Could you see the sign “ No Smoking” there?