Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
| A．have helped | B．helped | C．help | D．helps |
---Would you like some more beef?
---No, thanks. I’m ______ a diet.
| A．for | B．to | C．on | D．in |
At the wedding, he sang a song specially written for the ____.
| A．occasion | B．time | C．moment | D．period |
----- Is that Mr．Smith over there?
----- No, it _____ be him --- I am sure he is much taller.
| A．must not | B．may not |
| C．can’t | D．won’t |
---Is it good to look up every new word when I come across it in reading?
---No. You ______because you are likely to guess the meaning from the context.
A. can’t B. mustn’t C. don’t have to C. ought not to
—Shall we go out for______ meal this evening?
—Yes，that’s_____ good idea．
| A．a：a | B．a；the | C．the；a | D．the；the |