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 (選項輸入請用英文半角輸入，用全角輸入會導(dǎo)致自動判分出錯) 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 (選項輸入請用英文半角輸入，用全角輸入會導(dǎo)致自動判分出錯) 8. He was very busy yesterday; otherwise he ____ to the meeting. uldcomeD.hadcome(選項輸入請用英文半角輸入，用全角輸入會導(dǎo)致自動判分出錯) 9. I know a number of occasions____ people died from water pollution. C.whenD.where(選項輸入請用英文半角輸入，用全角輸入會導(dǎo)致自動判分出錯) 10. ____ seems easy in theory seems difficult in practice.A. That B. With C. What D. It

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