Keep in mind that you should try to spend your time on what you find ______.
| A．worthwhile doing | B．worth doing |
| C．worthy of doing | D．worthy to do |
You didn’t let me drive. If we＿＿＿＿in turn, you＿＿＿ so tired.
| A．drove； didn’t get | B．drove； wouldn’t get |
| C．were driving； wouldn’t get | D．had driven； wouldn’t have got |
What would have happened＿＿＿＿, as far as the river bank?
| A．if Bob has walked farther | B．if Bob should walk farther |
| C．had Bob walked farther | D．if Bob walked farther |
—— Will you stay for lunch?
—— Sorry, ＿＿＿＿＿. My brother is coming to see me.
| A．I mustn’t | B．I can’t | C．I needn’t | D．?won’t |
—— Why do you make me do so?
—— I am sorry that you＿＿＿＿＿＿＿＿do such a thing.
| A．would | B．can | C．should | D．may |
—— Must I take a bus ?
—— No, you＿＿＿＿. You can walk from here.
| A．must not | B．don’t | C．don’t have to | D．had better not to |