——Hey, you haven’t been acting like yourself. Everything OK?—— .
We ____ early to avoid the traffic,and it took us only half an hour to get here.
---Would you like some more beef?---No, thanks. I’m ______ a diet.
At the wedding, he sang a song specially written for the ____.
----- Is that Mr.Smith over there? ----- No, it _____ be him --- I am sure he is much taller.
---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