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UNIT 1　 Welcome Back!   1.-May I come in, please? 　-___. A.It doesn't matter B.Come in, please C.Thank you D.You are welcome 2.Please write the new words ___ this piece of paper. A.on B.in C.at D.for 3.Please come here ___ next time. A.earlier B.early C.more early D.most early 4.This is our first lesson, ___ I don't know all your names. A.because B.as C.since D.so 5.Now let me ___ you. A.to help B.help C.helping D.to helping 6.___ your Chinese teacher this term? A.Who's B.Who C.Whose D.What's 7.There ___ a beautiful ruler and some pencils in my pencil-box. A.has B.have C.is D.are 8.I don't want the red flowers. Can you give me some yellow ___. A.one B.the ones C.ones D.the one 9.His sister often ___ a white skirt, but now she ___ a red one. A.is wearing ... is wearing B.wears... wears C.is wearing... wears D.wears... is wearing 10.The students are playing ___ football now. A.a B.the C.an D./