Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
#68451
A
before
B
that
C
since
D
when
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In my opinion, all Mr. White ___ good to his students in his class at present. He is very strict in their study.
#72330
A
does does does
B
does do do
C
does does do
D
did do does
It’s said that he’s looking for a new job, one ______ he can get more money to support his family.
#72570
A
when
B
where
C
that
D
which
—Was his father very strict with him when he was at school？—Yes, he had never praised him _______ he became one of the top students in his grade.
#74587
A
after
B
unless
C
until
D
when
14．Life is like a ling race we compete with others to go beyond ourselves.
#74438
A
why
B
what
C
that
D
where