—What do you think of the concert given by the famous Hong Kong singer?　—Not so good. In fact, it _____ to be a great disappointment.　　

---Who would you rather ________ the English Speech Contest? ---- Li Ping, I think , is the best choice.

 _______ the smoggy weather, the central government has taken action to deal with it.

Considering his health, I advise him to ______ an hour or two each day to work out．

A study shows that students living in non-smoking dormitories are not likely to        the habit of smoking.