()It's nine o'clock. I must ______.
A
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There__________acatandtwodogsinmyhome
It'stime____playgames.
Therearesomanypeopleintheshop.Youmust________yourthings.
I’mtenyearsoldandmysisteristwoyearsolderthanme，sosheist_____yearsold。
Ithinkthe______(four)lessonisthemostdifficultinthisbook.
