At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, ______ to anyone.
| A．and not to speak | B．but could not speak |
| C．instead of speaking | D．or rather speak |
—I have got a headache.
—No wonder.You___in front of that computer too long.
| A．work | B．are working |
| C．have been working | D．worked |
The melon the Smiths served at dinner would have tastedif it had been put in the fridge for a little while.
| A． | good | B． | better |
| C． | best | D． | well |
He was told that it would be at least three more months______he could recover and return to work.
| A．when | B．before |
| C．since | D．that |
—What do you think of the performance today?
—Great!____but a musical genius could perform so successfully.
| A．All | B．None |
| C．Anybody | D．Everybody |
—Where is my dictionary?I remember I put it here yesterday.
—You___it in the wrong place.
| A．must put | B．should have put |
| C．might put | D．might have put |