What do you think is the best way to the pollution problem?
—Please keep the window _____, Jack ! It’s so hot!—Ok! And may the door be ______ now?
—What would you do _____ you had millions of money?—I am not sure _____ what you said is just my dream!
—Please spend much time ____your school work, ___ your parents will be annoyed.—OK. I’ll do it as you say!
—When does our class meeting begin?—Oh, it’s been _____ because of the sports meeting.
—Where do you live, Jack?—I live on the _____ floor. My room is No._______.