We should develop such ____ sources of energy as solar energy and nuclear energy.
A.alternative
B.tradition
C.surprising
D.revolutionary

_______ is a kind of energy formed from the remains of dead plants and animals.
A.Fossil fuel
B.Geothermal
C.Nuclear power
D.Solar energy

Either I or they_______ enjoying the party now.
A.are
B.were
C.is
D.was

Be careful_______ these chemicals, they may do harm_______ your health.
A.of – for
B.of-to
C.with – for
D.with-to

He looked tired because he _________ for six hours.
A.had run
B.had been running
C.has run
D.
was running

Instead of _______ about the good news, Hilary seemed to be indifferent.
A.being excited
B.to excite
C.being exciting
D.to be excited

She is the youngest________ to take part in this talent contest
A.competitiveness
B.competitor
C.competitive
D.competition

A/ an ____ is a person who is trained for traveling in a spacecraft
A.astronaut
B.scientist
C.technician
D.engineer

Human being have great ___________ on the rest of the world
A.attention
B.influence
C.attraction
D.focus

_________is a great source of energy but very dangerous.
A.Wind energy
B.Nuclear power
C.Water power
D.Solar energy