问题

Students should by all means ______ their studies though there are a lot of attractions around them. [ ]

A: devote to
B: fix on
C: keep on
D: concentrate on

正确答案是：

同类题型

The new dictionaries are very usefulThey ________ well and ________ already

I really don’t know next step.

It is considered by some people that to pay to see a movie will be foolish you can see it on TV for nothing.

(2013·高考四川卷)—Why are your eyes so red? You________have slept well last night.—Yeah，I stayed up late writing a report.

The situation in the Middle East is so ______ that we have to be ______ when dealing with the hostage issue. [ ]