is quite easy for people to find any place in the world with the help of online maps．（ ）
| A． |
That |
B． |
It |
C． |
One |
We're discussing why ______ for our health．（ ）
| A． |
are fast food bad |
B． |
fast foods are bad |
| C． |
fast food is bad |
D． |
is fast food bad |
I'm worried about the air．
______．There might be heavy pollution．（ ）
| A． |
Me too |
B． |
Never mind |
C． |
Of course |
D． |
Not yet |
It's hard to hold back the tears．This is ______thing I've ever heard．（ ）
| A． |
sad |
B． |
sadder |
| C． |
saddest |
D． |
the saddest |
What tools ______to make paper cutting？
Scissors．（ ）
| A． |
are used |
B． |
used |
C． |
will use |
D． |
use |
These light bulbs look the same，but their ______ on the environment are different．（ ）
| A． |
solutions |
B． |
methods |
C． |
effects |
D． |
secrets |