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It was ____ the old worker came that we ____ the  experiment.
#73098
A
until; didn’t begin
B
not until; began
C
until; began
D
not until; didn’t begin
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I slept on the bed _________ I put my shoes.
#72712
A
where
B
on which
C
under which
D
in which
Children will work actively if _______. 
#68018
A
praise
B
praised
C
praising
D
to praise
The theory he sticks to ______ to be of no use in our studies.
#72228
A
proves
B
prove
C
proving
D
be proved
Is this school ____ you studied at ten years ago?
#72337
A
which
B
that
C
where
D
the one
---- Did he come back early last night? ---- Yes. It was not yet eight o’clock _______ he arrived home.
#68294
A
when
B
that
C
before
D
until