They plan to plant trees next year．（ ）
| A． |
three hundred |
| B． |
three hundreds |
| C． |
three hundreds of |
﹣Have you set out？
﹣Yes，we have．We ____in two hours．（ ）
| A． |
arrive |
B． |
arrived |
| C． |
will arrive |
D． |
have arrived |
﹣Aunt Sally，the noodles you cooked are really delicious．
﹣____________．（ ）
| A． |
Thank you |
B． |
Good idea |
| C． |
Not at all |
D． |
Have a good time |
﹣Whose notebook is this？
﹣It ___ be Alan's．It looks like his．（ ）
| A． |
must |
B． |
can't |
C． |
might |
D． |
mustn't |
Fewer people smoke now﹣．The number of smokers is（ ）
| A． |
falling |
B． |
rising |
C． |
growing |
D． |
increasing |
It's going to rain．We'll be wet ___we get home．（ ）
| A． |
if |
B． |
after |
C． |
when |
D． |
unless |