--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
-- 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
--Ruby,__________the steps when you wear shoes with high heels.
--Thanks,I will.
A.minding B.mind C.to mind
We can make a fire__________the room warm so that we can chat for a while.
A.to keep B.keeping C.keep
We need clean air and water. So we__________ protect the environmen.
A.must B.can C.may
--Look at the children in the park. They are playing so happily.
--Yes, they have__________to worry about.
A.something B.nothing C.everything
