—What were you doing at this time yesterday? —I ______ on the grass and playing with Tony.
—Whose workbook is this, Tony?—Look! Ann's name is on it! It ______ be hers.
—______ will you come back from Shanghai? —In one month.
—I went to Daming Lake yesterday.There were ______ people.—Yes.Everyone wants to go out on such a good day.
More and more people find ______ necessary to protect our earth.
My father has ______ for two weeks.I miss him so much.