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____________. A. Yes, e in. B. Yes, it is. C. Sure. Here you are. D. Thank you. ( ) Where is ______ mother? She is ______ the kitchen. A. he。 on B. you。 in C. your。 in D. your。 on ( ) Is this your school bag? ____________. A. Yes, I do. B. Yes, it is. C. Yes, I am. D. No, I don’t. ( ) Can I help you? ___________. A. No, I don’t. B. I like this toy train. C. I’d like the toy train. D. Yes, I do. ( ) ______ you like ______ dogs? A. Do。 this B. Do。 a C. Do