Students should by all means______ their studies though there are a lot of entertainments inviting them.
#83653
A
devote to
B
fix on
C
concentrate on
D
pay their attention
推荐题目
These tress ________ and also ____________. 
#71076
A
need trimming(修剪); need to water
B
need to trim; need watering
C
need trimming; need watering
D
need be trimmed; need be watered