—He looks very happy. He ____have passed the exam,
—I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
______more effectively with foreign firms, many Chinese firms have turned to new technology．
| A．Being competed | B．To compete | C．Competing | D．Competed |
Those books ______ in brown paper are for the kids so that the kids will not easily tear them
up．
| A．to do with | B．done up | C．being done | D．having done over |
You ______ regret all your life if you drive after you take some wine, I tell you．
| A．shall | B．may | C．must | D．can |
______ he works hard, I don’t mind when he finishes the experiment．
| A．As long as | B．As well as | C．So far as | D．As soon as |
—Can you lend me some money?
—By all means．Can $10 ______?
| A．make | B．OK | C．do | D．go |