More new machines will be bought to __________ the old ones.

Many a professor__________looking forward to visiting Germany now.Many scientists__________studied animals and plants in the last two years.

Our bad living habits will destroy the earth. Only by changing we livesave the earth.

137 The young couple bought a ________with two halls and four rooms when they got married

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）晨间听蝉，想其洁。 ， ， ， ， ， 。蝉亦是禅。①高据树梢，餐风饮露，不食人间烟火②似远似近，又似有似无③蝉该是有翅之族的隐士吧④那蝉声在晨光朦胧中分外轻逸⑤有一种“何处惹尘埃”的了悟⑥一段蝉唱之后，自己的心灵也跟着透明澄净起来