－Have you known each other for long?－Not very long, ____________ we started to work in the company.
#31535
A
after
B
before
C
when
D
since
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— May I go and play football with Dick this afternoon, Dad?— No, you can’t go out ________ your work is being done.
#80246
A
before
B
until
C
as
D
after
The factory has developed a lot____ we visited the advanced worker five yeas ago.
#34010
A
when
B
which
C
that
D
where
The problem of the present world is that those who are imaginative have little experience_________those who are experienced have weak imagination.
#31024
A
unless
B
although
C
because
D
while