If we________ , we can realize the progress we have made in space research.
#81909
A
turn back
B
look back
C
answer back
D
move back
推荐题目
Astronaut as he was, he didn’t know _______ he had to _______ in outer space.
#73264
A
how; deal with
B
what; deal with
C
how; do with
D
what; be done with
--- Have you heard that George quit his job? ---Yeah, but I can’t why he did so．
#71267
A
put out
B
figure out
C
carry out
D
send out
In the dark street, he could find nobody he could ______.
#65088
A
turn off
B
turn to
C
turn out
D
turn away
The news came as no surprise to me. I ______ for some time that the factory was going to shut down.
#67683
A
knew
B
had known
C
have known
D
know
The number of the students in our school ________ about 3000 and ______ them study hard.
#67936
A
is, a large amount of
B
are, a number of
C
are, large amount of
D
is, a large number of