be of value = be valuable

a valuable（valued） experience 宝贵的经验

This jewellery is invaluable(priceless).

The glass is valueless(worthless).

5. attend v. 出席，参加；照顾；侍候；倾听

attend class(school,a meeting,a wedding)

attend to somebody 照顾某人

attend to what sb says. 倾听某人说话

6. average n.平均数 ,一般水平，平均标准

　　　　　　adj.平均的，普通的,平常的，一般的

on (the /an）average 平均

On average we have senven periods a day.

我们平均每天上七节课。

below /above/beyond average 低于/高于/超过平均数

with an average of 平均为......

an average rate 平均费率

The average of 4,5 and 9 is 6. 4，5，9三数的平均数是6.

I was just an average sort of student.

我只是一个普通的学生。

7. motivate vt. 激发，激励; 作为......的动机

He was motivated by the book. 他受到了这本书的激励。

be motivated by greed/love 受贪欲，爱的驱使

motivation n（u) 动力，积极性

(c) 动机，原因

The stronger the motivation, the more quickly a person will learn a foreign language.

　　一个人的学习欲望越强，那么他的外语就学得越快。

What was your motivation for becoming a teacher？

8. deserve v. 应得（奖赏，特殊待遇等），值得

She deserves a reward for her efforts.

deserve不用于进行时，用doing或to be done两种形式表示被动含义。