②Since their parents strongly disagree，they are________to marry.

　　③He is more________his mother than his father.

　　④John is________to be in London this autumn.

　　Keys: ①unlike　②unlikely　③like　④likely

　　4． It was not immediately obvious that water was to be fundamental to the development of life.(P26)

　　用fundamental的适当形式填空

　　①Soil is________to the growth of the plants.

　　②By the 2010s，the situation had changed________.

　　Keys:　①fundamental　②fundamentally

　　5．What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.(P26)

　　句型转换

　　①Too much worry does harm to one's soul and body.

　　→Too much worry____________one's soul and body.

　　②Asking your teachers for advice more often does no harm to you.

　　→____________asking your teachers for advice more often.

　　Keys: ①is harmful to　②There is no harm in

　　6．This produced a chain reaction, which made it possible for life to develop.(P26)

　　完成句子

　　①我认为过量喝酒对你的身体有害。

　　________________to your health to drink too much.

　　②我们每天晚饭后散步已成惯例了。

　　We________________to walk after supper.

　　Keys: ①I think it harmful　②(have)made it a rule

　　7．They laid eggs too and existed on the earth for more than 140 million years.(P26)

　　用exist的适当形式填空

　　①He doesn't believe in the________of God.

　　②Does life________on other planets?

　　Keys:　①existence　②exist

　　8．Thus they have，in their turn，become the most important animals on the planet.(P26)

　　介词填空

　　①We should take turns________looking after the old man.

　　②The new couple of lovers did housework________turns.

　　③When they had a rest，we went on with it________our turn.

Keys: ①in　②by　③in