As we all know ,Columbus          America and Edison         light bulbs.
#53582
A
discovered ; invented
B
invented ; discovered
C
discovered ; discovered
D
invented ; invented
推荐题目
There ______ a sports meeting tomorrow afternoon. 
#53718
A
is going to have
B
will going to be
C
is going to be
D
will go to be
Some of my friends eat with their eyes, they prefer ______ what _______ nice. 
#56727
A
to order; looks
B
to order; feels
C
ordering; smells
D
order; tastes
  —Did you go to Linda’s birthday party, Jill?—No. I ______.
#52120
A
didn’t invite
B
wasn’t invited
C
am not invited
D
haven’t invited
Doing eye exercises         well in         our eyes. 
#58227
A
work; protecting
B
works; protecting
C
works ; protect
D
work; to protect
Thanks to those brave firemen,the big fire was      soon.
#63581
A
put up
B
put away
C
put out
D
put on