—I think everyone must do his best to _______pollution.—If so, there will be a good future for people of tomorrow.A. keep B. stop C. stand
Do you think Jack is ____ honest boy?
She’s never been to Sanya,______?
The teacher with his students _____ playing _____football at this tine yesterday.
You must be very tired. Why don’t you______ a rest?
All lights______after the students left the classroom.