According to the text, mistakes give us chances to（   ）

• A、
  know the truth
  
  
  
  

• B、learn something new
  
  

• C、
  do some experiments
  
  
  
  

• D、
  teach a child a lesson
  
  
  
  

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

The mother and the son went out in the back yard to（   

• A、fill the bottle with milk
  
  

• B、clean the bottle
  
  

• C、find a way to carry the bottle
  
  

• D、search for a new bottle