—What do the letters “DOS” ______?—Disk Operating System.
#82511
A
call for
B
stand for
C
head for
D
care for
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Everyone should _______________ the environment.
#66667
A
make a contribution to protect
B
make contribution to protecting
C
contribute in protecting
D
make contributions to protecting
Do remember or wash the vegetables ___.
#81092
A
as clean as possible
B
as cleanly as possible
C
possible as clean as
D
possible as cleanly as