He started to learn English in 1990 and in the years ________ he kept on using it in his work.
单项填空Only in this way______ get ready for the coming mid-term examinations.
______ the room, the nurse found the tape-recorder ______ .
The women kept her eyes _____ on her baby for quite some time.
____ is known to all, China will be an _____ and powerful country in 20 or 30 years’ time.
You can’t take the lift because it is _______.