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6. Tom's hobbies are swimming
A. or
7. The sun can be an
A effectively
collecting stamps.
C. so
source of power.
B. but
D. and
B. effective
C. efficient
D. inefficient
8. Are you sure that new energy doesn't cause
A. pollution
9 The innovations in energy will save money as well as
B. unpolluted
C polluting
D. polluted
the Earth's resources
C. conserving
lead to even more job losses
C. luckily
A. conserved
B. conserve
D. to conserve
10. Technological advances could
A. ultimately
B. efficiently
D. untidily