3. My experience tells me that to ______________ needs a thorough and persevering process, and in this process you had better abide by the principles mentioned above.

2. Everything has its own two sides, no exception with AAA. For one thing, ______________. for another, ______________.

1. The most effective means to solve this problem is that ______________. In that case, ______________.

15.　 _____ , he knows a lot of things.

A. A child as he is　　　　 B. As he is a child

C.　 Child as is he　　　 D. Child as he is

14.　 We won’t give up _______ we should fail ten times.

A. since　　 B. even if　　 C. whether　　　 D. until

13.　 He ran off _______ I can stop him.

A. since　　 B. after　　　　 C. before　　　　　 D. when

12.　 ______ from the top of the building, and you’ll find the city more beautiful.

A.　 To see　　　 B. See　　　 C. Seeing　　　　 D. Seen

11.　 When _______, the museum will be open to the public next year.

A. completed　 B. completing　 C. being completed　 D. to be completed　

10.　 The poor man, ______, ran out of the dark carve.

A. trembled and frightened　　　 B. trembling and frightened

C. trembling and frightening　　　 D. trembled and frightening

9.　　　 To learn swim well, ________.

A. much practice is needed by one　　 B. much practice is needed

C. one needs much practice　　 　　　D. one is needed much practice