.--Look, there are ______number of ducks swimming in the river.
--Yes. ______number of them is over ten.
A. a; A B. the; The C.a; The D. the; A
--Will Tom come to our party?
--______I’m not sure.
A. Nearly B. Certainly
C. Perhaps D. Impossible
They were all very tired, but ______of them took a rest.
A. none B. nobody C. all D. both
After the hard work, what we want is ______a rest.
A. have B. has C. had D. to have
You _____keep the water running all the time, because you’re wasting water.
A. ought to B. ought not
C. not ought D. ought not to
--Ann has finished her homework, hasn’t she?
--Yes. She ______it an hour ago.
A. finished B. finishes
C. has finished D. will finish
