Xi Jinping，our president，paid a visit to Harbin last month．How encouraging!（ ）
| A． |
63 years old |
B． |
63 years'old |
C． |
63﹣year﹣old |
Did you pass the test？
Yes．I'm very _____ for your advice．（ ）
| A． |
thankful |
B． |
careful |
C． |
useful |
D． |
helpful |
You can't smoke here．
Sorry，I ______ the sign．（ ）
| A． |
don't see |
B． |
didn't see |
| C． |
haven't seen |
D． |
won't see |
He is not old enough ________ to school．（ ）
| A． |
gone |
B． |
going |
C． |
went |
D． |
to go |
Can I go swimming，Mom？
Certainly．But you ____ be back by four．（ ）
| A． |
can |
B． |
may |
C． |
might |
D． |
must |
Which do you like ____，tea or coffee？（ ）
| A． |
well |
B． |
better |
C． |
best |
D． |
most |