—— Bob looks very blue. What has happened to him?
—— Perhaps his failure in the exam _____ his low spirits.
A accounts for B looks for C makes for D takes for
He borrowed $100 from his boss and was given ten months to ______ the debt.
| A．give back | B．bring back | C．pay for | D．pay off |
The old man _____ chess but now he doesn’t enjoy it.
| A．used to play | B．used to playing |
| C．was used to play | D．was used to playing |
There is no doubt _____ he means to help, but in fact he just gets in the way.
| A．that | B．whether | C．what | D．if |
______the importance of education, the villagers paid more attention to the schooling of the children.
| A．Realized | B．To realize | C．Realize | D．Having realized |
_____wild animals when you go up the hill.
| A．Look out for | B．Take care | C．Take care of | D．Be careful |