----- Must I turn off the gas after cooking?
----- Of course. You can never be ______ careful with that.
A.enough B.too C.so D.very
He told me he had been offered a well-paid ____, but he refused it.
A.business B.service C.work D.position
He has written a lot of books, but ______ good ones.
A.any B.some C.few D.many
Everyone here will thank the firefighters for the things they do to prevent fires ______ the environment safer.
A. to make B.make C.making D.from making
If Newton lived today, he would be surprised by what ______ in science and technology.
A. had discovered B. had been discovered
C. has discovered D. has been discovered
Does John know any other foreign language ______ English?
A.except B.besides C.but D.beside
