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
—Can you understand what I said, Ben?—No problem, I can _______ follow you.
#38330
A
seldom
B
easily
C
hardly
D
not
We all feel after hearing of the news.
#35623
A
excited;excited
B
exciting;exciting
C
excited;exciting
D
exciting;excited
workers in the factory over two thousand.
#43491
A
The number of; is
B
The number of; are
C
A number of; is
D
A number of; are
Simon always feels sure about his own ability, he is so ______
#43106
A
energetic
B
outgoing
C
imaginative
D
confident