Liu Ming is ________ 18-year-old student．He got a gold medal in the competition．
a
an
the
－I think it's going to be a problem．
－Yes, it could be．
－I wonder ________ we can do about it．
what
how
if
that
What do you think we should ________ improve our environment?
do
to
do for
do to
We should sort the waste before ________．
throw it away
throwing them away
we throw away it
throwing it away
He seemed ________ when he ________ the news．
surprised, told
surprised, was told
surprising, told
surprising, was told
Ninety ________ teachers and students plant ________ trees every year．
thousands; million of
thousand; millions of
thousands of; millions of
thousand; million
There are some dangerous fishes in the river, and they've warned us ________ in it．
not to swim
to not swim
swim not to
not swimming
When you ________ the street, you must look first．
across
go cross
cross
goes across
She feels ________ tired today．
bit of
a bit
a little of
a bit of
－________ bad weather it is!It's rainy for two weeks．
－Yes, but the radio says it's going to stop ________ tomorrow．
What, raining
What a, blowing
How, snowing
How a, fishing