Wearemakingamodelplane.(变成一般疑问句)
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Ithinkthe______(four)lessonisthemostdifficultinthisbook.
()Whoisthe_____?Heismyuncle.
()Pleasegive____acupoftea.
Thereare_____studentsinourclass.Thatis19boysand21girls。
()Look!Thecatis_______.
