I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．
#79738
A
while; when
B
when; what
C
before; that
D
when; that
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The head of the company promised to deal with matters of this sort _____he returned to his office．
#32768
A
until
B
while
C
by the time
D
the moment
The baby, ________health was ruined after taking the medicine, was only one year old.
#30641
A
which
B
whose
C
who
D
whom
—Bread ______ butter? — Bread ______no butter. thank you.
#33125
A
or, and
B
and, but
C
or, but
D
and. and
--- John failed his final exam.-- I’m not surprised at the news at all. _______, he is never seen busy with his lessons.
#31414
A
Above all
B
In all
C
First of all
D
After all
He is confident, ______, in my opinion, is most important in modern society.
#30561
A
who
B
that
C
which
D
what