As there is less and less coal and oil, scientists are exploring new ways of making use of _____ energy, such as sunlight, wind and water for power and fuel.
A.primary B.instant C.unique D.alternative
Try ____ he might, he failed to put it off.
A.although B.as C.unless D.if
__ that's important is that you are doing your best and moving in the right direction.
A.One B.All C.Everything D.Anything
Astronauts who are accustomed _____ views that you and I cannot really describe were moved _____ tears when they looked out the windows of the spacecraft for the first time.
A.in, by B.from, by C.to, to D.with, to
Eric, ____ yourself. Did you forget the school rules?
A.behalf B.believe C.behave D.betray
Most of the films are now released at multiplex cinemas, which have boomed in recent years, and ____ more than two-thirds of the ticket revenue generated by the movie industry.
A.on account of B.account for C.take account of D.by all accounts
