We need clean air and water. So we__________ protect the environmen.
A.must B.can C.may
We can make a fire__________the room warm so that we can chat for a while.
A.to keep B.keeping C.keep
--Ruby,__________the steps when you wear shoes with high heels.
--Thanks,I will.
A.minding B.mind C.to mind
-- Would you like to buy this watch?
--I'm afraid I cant afford it I want to buy a(n),__________one.
A.expensive B.cheaper C.cheap
--Lisa, have you ever visited Mountain Tai?
--Yes, I__________in Mountain Tai for three days and enjoyed myself there.
A.stay B.stayed C.have stayed
__________it was very cold outside, many people went to the park to take exercise.
A.Until B.Though C.If
I think the restaurant is great because the customers here__________the best service in town.
A.are given B.give C.have given
--I hope you can__________the problems and complete the work on time.
--I will.
A.get off B.get over C.get up
Mary is a pretty girl in our class__________always likes to help others.
A.who B.whose C.whom
__________exciting news it is!
A.What B.What an C.How