31. He forgot
Dut
D. turned
off the gas before going out.
B. turning
C. to turn
money for the poor people in our neighborhood.
B. to save
D. saved
A. save
33. We can protect the environment by
A. reduce
B. reducing
34. I want to see the
A. protect
35. Oh dear! How
A. heavy
air pollution.
C.roduced
of environment from the local authority.
B. protected
D. because
B. enormous
36. Energy can be collected by solar
A. boards
B. panels
37. If we don't find
A. alternative
C. protecting
our household bills are! We can't pay them
C. small
on cloudy days.
D. to reduce
D. protection
7
sources of power, we will use up all the fossil fuels in the near futur
C. naturally
D. effective
B. natural