1come over
2come straight to
3come to one's mind
4come undone
5come up
6come up with
7come what may
8complain about
9computer division
10computer programming language
11concentrate on sth./ doing sth.
1conference center
2construction crew
3contact lenses
4cook out
5cool off
6cool off
7copying machine
8cost a fortune
9cost sb. an arm and a leg
10cough medicine
11couldn't make heads or tails of sth.
12count on
1count sb in
2count sb out
3course sheet
4cram for
5criminal law
6cross out
7curly hair
8curriculum committee
9customer service
10cut down on
11cut down the number of
12cut off