Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
#67597
A
since
B
after
C
before
D
when
---It is a long time ______ I saw you last． ---Yes．And it will be a long time ______ we see each other again．
#67598
A
when; before
B
after; when
C
since; before
D
since; until
______ at the top of the Oriental Tower, people below will look very small.
#67600
A
Stand
B
Standing
C
To stand
D
If you stand
While previewing his lessons, the little boy will make a question mark ________ there is a question.
#67602
A
where
B
when
C
because
D
which
_________ hard one may work, one cannot master a foreign language in a year or two.
#67604
A
Though
B
As
C
While
D
However
--Did Mary return late last night?--No. It was not yet 7 o’clock _________ she arrived home.
#67606
A
before
B
when
C
that
D
until
_________ across the railway, a train hit it.
#67607
A
While walking
B
Walking slowly
C
As the little pig walking
D
While the little pig was walking
Finally, he found his calculator __________ he lost it.
#67609
A
the place in which
B
in which
C
the place where
D
where
Nobody believed his reason for being absent from the class he had to meet his uncle at the air port.
#67613
A
why
B
that
C
where
D
because
If you are traveling the customs are really foreign to your own, please do as the Romans do.
#67615
A
in which
B
what
C
when
D
where
__________ difficult the task may be, we will try our best to complete it in time.
#67617
A
Whatever
B
No wonder
C
Though
D
However
_________ you may have, you should gather your courage to face the challenge.
#67618
A
Whatever serious a problem
B
However serious a problem
C
However a serious problem
D
No matter how a serious problem
The problem will appear____ a different welfare system will be created.
#67620
A
unless
B
whether
C
until
D
if
Someone called me up in the middle of the night, but they hung up ________I could answer the phone.
#67622
A
since
B
until
C
before
D
as
This is my own restaurant. You can come to eat here ____ you like.
#67624
A
wherever
B
whatever
C
whichever
D
whenever
A serious illness, ______ its nature, is almost always painful.
#67625
A
whatever
B
wherever
C
whenever
D
however
The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
#67627
A
that; what
B
which; that
C
what; what
D
which; that
As you wander through the streets, you see thousands of masks but you have no idea_____ the faces behind them look like.
#67631
A
which
B
what
C
that
D
how
______ the outcome of the war is, there will be no winners.
#67633
A
However
B
Whereever
C
Whenever
D
whatever