Nowadays scientists are working hard to find out ______ to do with air pollution.
#37100
A
how
B
why
C
when
D
what
推荐题目
Now more and more people ________ sending e-mails ________ letters.
#43291
A
prefer to; to writing
B
prefer to; to write
C
prefer; to writing
D
prefer; to write
I go to school by _______, but my best friend goes there ______foot.
#39063
A
a bike; by
B
bikes; on
C
bike; on
D
bike; by
—Mr. Smith, would you please speak a little more ________?—Sorry! I thought you could follow me.
#37920
A
quietly
B
slowly
C
quickly
D
politely
It’s a wise ________ to wear the white tie. It matches your shirt well.
#35808
A
agreement
B
support
C
choice
D
condition