1. ___ in the air, fuels give off heat.

　　A. To burn B. Burned C. To be burned D. Being burned

　　【答案】B分詞做狀語。fuel是burn的賓語，因此使用被動(dòng)式;前半句相當(dāng)于省略了的狀語從句，全句為When fuels are burned in the air, fuels give off heat.

　　2. ____ from space, our earth, with water covering 70% of its surface, appears a “blue planet”.

　　A. Seen B. Seeing C. To be seen D. Having seen

　　【答案】A 本題考察非謂語動(dòng)詞;see 的邏輯主語是句子的主語，即the earth, 是see (看)這個(gè)動(dòng)作的對象，二者之間為動(dòng)賓關(guān)系，所以應(yīng)該用被動(dòng)式。

　　3. ________ by the beauty of nature, the girl from London decided to spend another two days on the farm.

　　A. Attracting B. Attracted C. To be attracted D. Having attracted

　　【答案】B 被美景吸引，因此選被動(dòng)

　　4. They sent us their statement, ___ to get our support.

　　A. hoped B. to hope C. hoping D. having hoped

　　【答案】C如果選A項(xiàng),則它前面應(yīng)有and,與主句構(gòu)成并列關(guān)系. 排除A. to get our support本身即表示目的，沒有必要再在前面加上不定式to hope表示目的,故排除B.而D項(xiàng)表示完成,從句沒有完成的意思.故選C,現(xiàn)在分詞短語作伴隨狀語. 句意是“他們給我們發(fā)了聲明,希望獲得我們的支持.”

　　5. When asked why he went there, he said he was sent there ______for a space flight.

　　A. training B. being trained C. to have trained D. to be trained

　　【答案】D。他被送到那里進(jìn)行太空航行訓(xùn)練。