9. Still the classification into “learned” and “popular” is convenient and sound .本句中的sound是形容词，意思是“正确的；明智的”，如：
1）He felt so happy that he had made a sound decision.
2）He was so carried away by power that he could not make any sound judgement
1）He is sound in body and mind （他身心健康）
2）The house is sound .Don't hesitate to buy it （这所房了完好无损，别犹豫，买下它）
3）The baby is having a sound sleep.（宝宝在酣睡）
4）Father gave him a sound beating.（父亲给他一顿痛打）
10.When we call a word “learned” we don't mean that it is used by learned persons alone， but simply that its presence in the English vocabulary is due to books and the cultivation of literature rather than to the actual needs of ordinary people
not （that）…。but （that）。意思“不是…。而是。”如：
1）I came here again not because I enjoy the scenery so much but because I like the people .
2）By calling him Shylock， I don't mean that he is named Shylock，but that he is as miserly as Shylock.
due to 在句中的意思是“由于”，如：
1）His failure was due to carelessness （他的失败是由于粗心。）
2）Due to lack of funds，they had to postpone the project.（由于缺少资金，他们不得不推迟计划）
rather than 在本句的意思是“不是…而是……”，“与其……不如…”
1） He is a writer than a teacher （与其说他是教师，不如说他是作家。）
2）He lay rather than sit in the armchair （与其说他是坐在扶手椅上不如说是躺在里面。）
2.be familiar with
6.on the other hand
7.be knows to
9.in a style
10. be of importance
11. in the first case
12. in the latter （case）
13. in print
14. apply to
15. come up
16. as to
17. as a whole
18. due to
19. rather than
Text B how should you build up your vocabulary？
1. build up （建立；增强；增加）
They worked hard to build up the friendship between the people in two countries.
Get plenty of exercise every to build up your health.
2. come across （穿过，出现；遇到）
They came across the street to meet me.
A good idea came across my mind
We are bound to come across difficulties， but we are determined to overcome them.
3. look up （查阅）
If there are words you don't understand， look them up in the dictionary .
For further information about this matter， look up this book.
4. at top speed （以最高速度）
He drove his car at top speed
It's dangerous to corner at top speed
5. depend on （依靠；取决于）
We'll depend mainly on ourselves to solve the problem.
The accomplishment of the task depends on the solution of this major problem.
6. make sense （有意义、讲得通）
What he said just now didn't make any sense to me.
This sentence doesn't make any sense.
7. try doing sth（尝试做某事）
You can try using another method to go it
He tried climbing the mountain without any help.
8. come up with （提出，想出；提供）
He is expected to come up with some ideas after he thinks about the problem.
The TV network will come up with better shows in the future.
9. lead to（导致）
Our discussions led to confusion. The earthquake led to heavy loss of life.
10. after all （毕竟）
Don't expect too much of him， he is， after all， a child of 10.
We didn't finish all the work. After all， we didn't have enough hands
11. provide with （提供）
It is necessary that you provide them with all the equipment
We are satisfied to be provided with these kitchen utensils
12. begin with （以……开始）
The first word of a sentence should begin with a capital letter .
To begin with， we ought to know what we are here for.