1) be worth n/doing：

　　This dictionary is worth 150 yuan.

　　The novel is worth reading. (or It is worth reading the novel.)

　　2) be worthy of n./ being done / be worthy to be done

　　3) be worthwhile doing / to do

　　It’s worthwhile reading this story.

　　Reading this story is worthwhile.

　　It’s worthwhile to read this story.

　　I thing it is a worthwhile job, and my attempt is worthwhile.

　　2、He was driving a lorry load of bananas when he came off the road at a bend.

　　When =

　　at that time 这时突然。。。

　　We were doing our homework when the lights went off.

　　Jasmine was holidaying with her family in a wildlife park ____ she was bitten in the leg by a lion.

　　A. when

　　B. while

　　C. since

　　D. once

　　on average 平均；通常We fail one student per year on average.我们平均每有一个学生不及格。

　　【考点聚焦】 记住与average相关的习惯用语：

　　on the/an average平均； 按平均数计算；一般地说

　　above the average在一般水平以上；中上；在平均数以上

　　below the average在一般水平以下；中下；在平均数以下

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