—Guess what？ I have got A for my term paper.
—Great!You _______ read widely and put a lot of work into it.
| A．must have | B．should |
| C．must | D．should have |
One of the students hasn't prepared _____ lessons very well.
| A．one's | B．ones | C．their | D．his |
His attitude to us is _____ of a comrade.
| A．one | B．it | C．that | D．those |
He was ill. _____ is why he didn't attend the meeting.
| A．This | B．It | C．There | D．That |
Will he come back to school tomorrow? I hope _____.
| A．that | B．this | C．so | D．it |
The students encouraged _____ to go on.
| A．one after another | B．one another | C．the other | D．one by one |