Bicycle commuting could be more effective in reducing greenhouse gases.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

Task 2

21. People do voluntary work because they want to（   ）

22. Some volunteers help others by（   ）

23. Some organizations rely on volunteers to help（   ）

24. The elderly can have their meals delivered without（   ）

25. Many volunteers returning from poor countries（   ）

A. help others

B. leaving their homes

C. cooking for the elderly

D. using their professional skills

E.find their experience rewarding

F.preserve the natural environment

Gas prices keep going up.

• A、True
  
  

• B、False
  
  

• C、Not Given