I think it's impolite _______ others waiting．（ ）
A．to keepB．keepingC．keep
Henry was happy because ________ of his three sons came back home on Father's Day．（ ）
| A． |
both |
B． |
all |
C． |
either |
D． |
neither |
Is the man in the car John？
No，it ________ be him．He went to Xi'an on business yesterday．（ ）
| A． |
can't |
B． |
must |
C． |
mustn't |
D． |
could |
________ Chinese culture，many college students go to foreign countries every year．（ ）
| A． |
Spreading |
B． |
To spread |
C． |
Spreads |
D． |
Spread |
Nothing is ________ than keeping trying if you want to achieve your dreams．（ ）
| A． |
very important |
B． |
more important |
| C． |
the most important |
D． |
as important as |
The Changchun subway will be in use．________ will it take you to get to school on it？
Only ten minutes．It'll be quick and convenient．（ ）
| A． |
How much |
B． |
How many |
C． |
How often |
D． |
How long |