Scientists are working hard to make _______ possible for people to live on Mars in the future.A．itB．

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• — ThisisTom. _____ismygoodfriend.— Nicetomeetyou, Tom.[ ]A.SheB.HeC.HisD. It's-七年级英语
• I think____________ necessary _____________ to take more exercise.A．it, for Jim and meB．it’s, to Jim
• — _______ does Tom like math? —Because _____ fun.A．Why, it’sB．When, itC．Why, It’sD．When, it-七年级英语
• ---Dear me! What a beautiful computer!---My grandma bought ___for my sister and me. It’s ours.A．them
• — Jim, do you have a CD?—Yes, I have _____. And I bought _____last Sunday.A．one, itB．it, oneC．it, th
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