—It smells terrible. What has happened here?
—Look, there is much waste gas _____ from the chemical factory.
A.pour B.pouring C.poured D.pours
—Have you finished your homework?
—Not _____. There are still some exercises to be done.
A.already B.yet C.just D.ever
_____ the environment is important for human beings.
A.Take care of B.Taking care of
C.Took care of D.Take the care of
This is the most beautiful park I have _____ visited.
A.ever B.yet C.never D.already
Xi’an is a city with many places of interest and __ tourists come here every year.
A.thousand of B.thousand
C.thousands D.thousands of
—_____ you _____ your homework yet?
—Yes, I _____ it ten minutes ago.
A.Did; do; finished B.Have; done; have finished
C.Have; done; finished D.Will; do; finish
