20.American women usually identify their best friend as someone ____ they can talk frequently.

4. John seems a nice person, ____ I don’t trust him.

2. ____ many times, but he still couldn’t understand.

14．_______on May 12,2008, Wenchuan county has taken on dynamic new look gradually two years since then.

3．In nature some animals actively defend the area_____________they depend for the resources.

31．—Can you tell me what time the flight to Detroit leaves?
—I'm sorry, but it ______．

38. Eric taught folk music in a local school for one year, ______ he spent some time abroad studying jazz.

26. The way _______ the scientist solved the problem was different from what the other scientists were used to.

24. Only when the meeting began _______ that he had left his papers at his office.

20. _____ about the economic crisis that he decided to look for more information about it.