1 . Listening to music at home is one thing, and going to hear it ________(perform) live is quite another. （所给词的适当形式填空）

2 . _______ (tell) many times,he finally understood it. (所给词的适当形式填空)

3 . ________ many times, the boy still didn’t know how to do the exercises.

A．Having taught

B．Having been taught

C．taught

D．Teaching

4 . _________ (separate) from other continents for millions of years, Australia has many plants and animals not found in any other country in the world. (所给词的适当形式填空)

5 . Directions：Complete the following sentences by using non-finite verbs.
1. Prices of daily goods_________(网上选购的) can be lower than store prices at the present.
2. _________(被自然之美所吸引), the two girls from Paris decided to spend another two days on the farm.
3. It sounds a good idea, but it remains_________(有待今后见分晓) whether it will succeed.
4. Though_________(缺钱)，he managed to build a new house.
5. _________(在大山里迷路), the three travelers were scared and starved to death.
6. The ending of the novel is that the millionaire died without anyone_________(知道) where the coins were hidden.
7. Often hundreds of dead baby bats can be found_________(躺在地上) at the foot of a tree.
8. The lab_________(明年将要建的) will be more advanced than the old one.
9. _________(不希望碰见) anybody, he entered the room through the back door.
10. It is no use_________(和我爸爸争论), because he will never change his mind.
11. We certainly do！We have a special department devoted to_________(设计最好的广告) for your particular company.
12. It is important for modern young people_________(掌握至少两门外语).
13. _________(没有做正确的选择), the little boy wanted to try it again.
14. Columbus was considered_________(发现) the great land of America.
15. When he heard his mother’s steps on the stairs, he pretended_________(在做家庭作业).
16. As we all know，_________(从月亮上看), the earth looks blue.
17. There is no point_________(掩盖真相) for the sake of friendship.
18. _________(受伤的工人) are being taken good care of in the hospital.
19. It was impossible_________(避免不受打扰).
20. The article_________(正在写的) will appear in tomorrow’s newspaper.

6 . _________several times, the gift was finally accepted by my Chinese host family.

A．Turning down	B．Being turned down
C．Having been turned down	D．Having turned down