(5)in turn

　　(6)pull through

　　(7)pick up

　　(8)go ahead

　　(9)is harmful to

　　(10) blocks out

　　IV.完成句子

　　1．He_____________ (放好桌子)and went out ．(lie)

　　laid the table

　　2．We must do what we can to ______________________ (防止河流污染)．(prevent)

　　prevent the river from being polluted

　　3． _____________________ , you might as well make full use of it.(既然你有好机会)．(now that)

　　Now that you have a good chance

　　V.模仿造句

　　1．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.

　　造成这次意外的是的他过于粗心。

　　______________________________________________________

　　What caused the accident is that he was too careless.

　　3．They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish.

　　他没能通过考试，这让我们非常惊讶。

　　______________________________________________

　　He didn’t pass the exam, which made us surprised.

　　4．But when I tried to step forward I found I was carried twice as far as on the earth and fell over.

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