—Whose workbook is this, Tony?
—Look! Ann's name is on it! It ______ be hers.
| A．can't | B．must | C．may | D．mustn't |
—______ will you come back from Shanghai?—In one month.
| A．How long | B．How often |
| C．How soon | D．How fast |
—I went to Daming Lake yesterday．There were ______ people.
—Yes．Everyone wants to go out on such a good day.
| A．too many | B．too much |
| C．many too | D．much too |
More and more people find ______ necessary to protect our earth．
| A．it | B．that | C．this | D．its |
My father has ______ for two weeks．I miss him so much.
| A．left | B．leave |
| C．gone | D．been away |