Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
#11641
A
the; a
B
a; a
C
/; a
D
/; the
推荐题目
In my opinion, it's the flying birds rather than the pilot that________for the air crash.
#12574
A
are to blame
B
is to blame
C
is to be blamed
D
are to be blamed
The government has agreed to pay the firms extra sums to ________ for their financial losses.
#11047
A
make up
B
bring up
C
fill up
D
look up
While listening carefully, the students______ what their teacher said.
#12554
A
set down
B
turned down
C
got down
D
calmed down
The suggestion, ____ by the locals, proved to be a very constructive one.
#12292
A
put down
B
put forward
C
put out
D
put off