Only when I checked the paper once more _________ there was a mistake.
| A．I realized | B．did I realize | C．I had realized | D．had I realized |
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—I must thank you for taking the trouble to look after my sick mother.
—_______.
| A．With pleasure | B．It doesn’t matter | C．It was no trouble at all | D．By all means |
.
The teacher had the students __________ all the words they didn’t know.
| A．looked up | B．looking in | C．look up | D．look at |
.
. Did you notice the little boy __________ away?
| A．took the candy and run | B．take the candy and run |
| C．taking the candy and run | D．who taking the candy running |
.
The work should be given to ________ you think can finish it ahead of time.
| A．who | B．whom | C．whoever | D．whomever |
.
. His family, which _______ rather a large one, ______very fond of their old house.
| A．were, were | B．was, were | C．were, was | D．was, was |