4．So ______________ life will continue on the earth for millions of years to come ____________________ whether this problem can be solved.

　　所以， 在未来的数百万年中， 生命能否在地球上延续取决于这个问题能否得到解决。

　　5．As a result of this event, a great dust cloud formed in the sky ______________ the sunlight.

　　由于这一事件，天空中形成一大团尘埃，遮住了阳光。

　　Ⅳ.课文回顾

　　The earth was just a cloud of 1.________ (dusty) after the “Big Bang”. The 2.________ (explode) of the earth produced water vapour, which turned into water when the earth 3.________ (cool) down. Water allowed the earth to dissolve harmful gases into the oceans and seas. That made 4.________ possible for life to begin to develop. The 5.________(arrive) of small plants encouraged the 6.________(develop) of early shellfish and all sorts of fish. Many millions of years later the first green plants began to appear on land. Later land animals appeared.

　　Some were insects. Others, called amphibians，7.________(be) able to live on land as well as in the water. Finally, some small clever animals appeared and spread all over the earth. But they treat the planet in an 8.________(friend) way, and the earth becomes too 9.________(pollute). Whether life will continue on the earth for millions of years to come will depend on 10.________ this problem can be solved.

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