We found ______ very difficult for the children to understand what the chairman said at the meeting.
| A．that | B．its | C．this | D．it |
If the prediction for the earthquake ________ more accurate, we would have been more prepared and many more lives would have been saved.
| A．had been | B．was | C．has been | D．were |
—Where is Bob? I cannot find him anywhere.
—Hehave been off long. I heard him make a call just now.
| A．shouldn’t | B．can’t | C．mustn’t | D．needn’t |
Class regulations require _____ is the last to leave the classroom _____ off all the lights.
| A．who; should turn | B．whom; shall turn |
| C．whomever; turns | D．whoever; turn |
What impresses me most is _________ he appears in front of others, he wears a sincere and charming smile.
A. which B. that C. whereC. that whenever
Everyone has periods in their lives __________ everything seems very hard.
| A．when | B．where | C．which | D．that |