Action must be taken to prevent that factory from ______ heavy smoke into the air.
A. giving off B. putting away C. escaping from D. dealing with
— Can you see what is written on that board?
— Yes. It _______ “CAUTION: WET FLOOR”.
A. reads B. is read C. writes D. is written
Could you tell us ______ happens when one student in class expresses a personal opinion _______ maybe upsets other students?
A. that; that B. what; where C. that; where D. what; that
. Let’s take _____ ten-minute break and have _______ drink of water.
A. a; a B. the; the C. the; a D. 不填；the
He _______ us that everything would go according to plan, but it turned out a failure.
A. suggested B. demanded C. ordered D. guaranteed
. His sister left home in 1998, and_______since.
A. had not been heard of B. had not heard of
C. has not been heard of D. has not heard of
