Could you please help me wash the car， Tony？
____．I'm studying for my coming English test now．（ ）
| A． |
That's right |
B． |
I'm sorry |
| C． |
It doesn't matter |
D． |
Not at all |
Dad，____ can we reach Huangguoshu Waterfall？
In about an hour．（ ）
| A． |
how long |
B． |
how soon |
C． |
how often |
D． |
how far |
Paper ____ first ____ about two thousand years ago in China by Cai Lun．（ ）
A．is； inventingB．is； invented
C．has； inventedD．was； invented
____ noise pollution， and we can live in a quiet environment．（ ）
| A． |
Prevent |
B． |
Preventing |
C． |
Prevented |
D． |
To prevent |
Your new watch is so nice! When did you buy it？
In October． I ____ it for two months．（ ）
| A． |
had |
B． |
bought |
| C． |
have had |
D． |
have bought |