1.We hope that by using _________ the problem of the energy shortage.
A)solar energy
B) fossil fuels
C) coal and natural gas
D)non-renewable energy
2.In the countryside, plants ____________ to produce heat.
A) will burn
B) will be burn
C) will be burnt
D) will be burning
3.If there ______ no water and air, there ______ no life on earth.
A) was - was
B) were - were
C) is - will be
D) was - would
4.Cyclists and motorists have to wear a ……………… when they ride a motorbike.
A)cap
B) mask
C) helmet
D) hard hat
5.We are looking for cheap, clean, and _________ sources of energy
A) effective
B) attractive
C) expensive
D) harmful
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Sinh Học lớp 12
