----- Nội dung dịch tự động từ ảnh -----
for 50 percent of our electricity bill
C accounts
21 in winter, heating
A takes
22 Energy can be collected by solar
A boards
23 if we don't find
D costs
8. occupies
on cloudy days
D sheets
8. panels
C. bars
A alternative
24 We want to use solar energy.
8 natural
D. effective
C naturally
t cannot be used on continual cloudy days
C. because
A but
B. so
D. however
25 He is always broke He can afford neither luxuries
A or
basic necessities
B. nor
C. and
D. but
26
An enern