18．In this experiment, they are woken up several times during the night, and asked to report what they _______.
| A．are dreaming | B．had dreamt |
| C．had been dreaming | D．have been dreaming |
—Why are your eyes so red？You________have slept well last night.
—Yeah，I stayed up late writing a report.
| A．can't | B．mustn't | C．needn't | D．won't |
Harry is feeling uncomfortable.He________too much at the party last night.
| A．could drink | B．should drink |
| C．would have drunk | D．must have drunk |
—You needn't take an umbrella.It isn't going to rain.
—Well, I don't know.It________do.
| A．might | B．need | C．would | D．should |
What would have happened ________，as far as up to the river bank.
| A．Bob had walked farther |
| B．if Bob should walk farther |
| C．had Bob walked farther |
| D．if Bob walked farther |
You can't imagine that a well－behaved gentleman ________ be so rude to a lady.
| A．might | B．need | C．should | D．would |