. 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.alternative | C.instant | D.Unique |
You can hardly imagine how excited I was when the day I had been looking forward to _____ at last.
A.coming | B.come | C.came | D.comes |
The effect a teacher has _______ children may be greater than that of their parents.
A.in | B.on | C.at | D.with |
—Everyone in my class passed the exam.
—Oh, really? It ________ difficult.
A.can’t have been | B.needn’t have been |
C.must be | D.mightn’t be |
I ran across David while walking along the street yesterday. I ________ him for three years.
A.hadn’t seen | B.didn’t see |
C.haven’t seen | D.don’t see |
—You are required by law _______ seat belts.
—Thanks for your reminding. I’ll do it right away.
A.wearing | B.being worn | C.to wear | D.to be worn |