6. ____ from space, our earth, with water covering 70% of its surface, appears as "blue planet".A. Seen B. Seeing C. To be seen D. Having seen (选项输入请用英文半角输入，用全角输入会导致自动判分出错) 7. ____ from space, our earth, with water covering 70% of its surface, appears as a "blue planet". A. Seen B. Seeing C. To be seen D. Having seen (选项输入请用英文半角输入，用全角输入会导致自动判分出错) 8. He was very busy yesterday; otherwise he ____ to the meeting. uldcomeD.hadcome(选项输入请用英文半角输入，用全角输入会导致自动判分出错) 9. I know a number of occasions____ people died from water pollution. C.whenD.where(选项输入请用英文半角输入，用全角输入会导致自动判分出错) 10. ____ seems easy in theory seems difficult in practice.A. That B. With C. What D. It
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