Choose the correct answer

----- Nội dung dịch tự động từ ảnh -----
We should put
on our roof for the heating and hot water. *
A. equipment
B. cracks
C. solar energy
D. solar panels
At this time next week we
to work to support the air pollution cutting
down campaign. *
A.are cycling
B. will be cycling
C. will cycle
D. will be cycled
The wind, the sun, and the wave are some types of.
.sources of energy. *
A. changeable
B. alternative
C. cheap
O D. costly