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All of the boys must      (be)here before seven o’clock.
Life      (be) a good teacher.It has taught me how        (think).
—Who     (knock) at the door?—I       (not know).Let me go and see.
I’m glad        (hear) that you        (pass) the exam already.
Would you like something        (eat)?
My daughter wanted        (go) to Beijing by air.
My son        (be) three years old next year.
— you        (have) your lunch?
—Yes,I        (have) it just now.
The girls are interested in        (dance).
Would you please        (not turn) on the TV now?