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k at the sky. Are ____ birds? A. this B. that C. these D. those 3. This is my sister. (變復(fù)數(shù) ) _______________________ 4. That is a tree. (變復(fù)數(shù) ) _______________________ ( )5. —Is that your uncle? —____. A. Yes, it’s B. No, he isn’t C. Yes, it is D. No, that isn’t ( )6. —____ those your pencils? —Yes, ____. A. Is。 those are C. Are。 they are ( )7. —What are these, Lily? —____. A. They are apples trees B. They are apple trees C. These are apple trees D. These are apples tree ( )8. —John, ____ Jack. —Nice to meet you, Jack. A. he is B. this is C. this’s D. he’s 3 ( )9. —Hello, this is Wend