---Do you know second-hand smoke?
---To protect our health and memory.
A. how we should prevent B. why should we prevent
C. why we should prevent D. whether we should prevent
—________？ —He is of medium build and has a big nose.
A．What does his uncle do
B．What does his uncle look like
C．What can his uncle do
D．What is his uncle doing
Jim was seen ______ in the library from 3p.m. to 5p.m yesterday.
He is often noticed _____ the library.
A. reading, to enter B. to read, to enter into
C. reading, enter D. to read, entering into
— Did you see Mr. Black just now? —Yes, He ___ his car when I met him.
A. parked B. was parking
C. parks D. will park
--- Do you know the woman ____ is walking on the other side of the street?
--- Oh, that’s my history teacher.
A. What B. which C. who D. whom
The air in Xuzhou is much worse than that in many other cities.We must do______to protect our environment.
A．nothing B．anything C．something D．everything
