—Recent pressure at work may ______ his behavior.
The program was so fascinating that the children kept their eyes _____on the screen. A.to fix B to be fixed C.fixed D.fixing
We must be sure that children in our country should get well ______. A.educate B educating C.education D.educated
The professor devoted all his life ____the treatment of AIDS.A to research B.in researching C.to researching D.at researching
----Where did you put the broom,Tom? -----I _______it behind the door.But now it is gone.
They experimented _____the new medicine _____animals. A.on; to B by ; on C.with ; on D with; to