—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?

The weather in the south is generally warm, but it________ be very cold sometimes.

---Did they have a good time at the party?---Judging by their smiles, they _________ have enjoyed themselves.

 You _____ me because I didn't say that.

 Don’t worry. You ________ have that book tomorrow.