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books? ( ) 3. ___ they in your desk? ( ) 4. Yes, it ____. ( ) 5. ___ she your friend? ( ) 6. Yes, they ____. ( ) 7. Who ___ he? ( ) 8. They ___ in the door. 單數(shù) is 復(fù)數(shù) are 復(fù)數(shù) Are 單數(shù) is 單數(shù) Is 復(fù)數(shù) are 單數(shù) is 復(fù)數(shù) are 二 根據(jù)要求寫單詞。 1. mouse(復(fù)數(shù) )_______ 2. sheep(復(fù)數(shù) )_______ 3. children(單數(shù) )_______ 4. photo(復(fù)數(shù) )_______ 5. country(復(fù)數(shù) )_______ 6. bus(復(fù)數(shù) )__