﹣_____________ has Hong Kong been back to our motherland？
﹣For 20 years．How time flies!（ ）
| A． |
How soon |
B． |
How long |
C． |
How often |
Go back _____ you come from．（ ）
| A． |
why |
B． |
where |
C． |
when |
D． |
how |
Do you know ________ the Smiths left Shanghai？
I'm not sure about the date．I only remember it was a Sunday．（ ）
| A． |
if |
B． |
why |
C． |
how |
D． |
when |
Could you tell me ______ you will come back？
In ten minutes．（ ）
| A． |
how soon |
B． |
how often |
C． |
how long |
D． |
how fast |
Look!Someone _______ the classroom．
Well，it wasn't me．I didn't do it．（ ）
| A． |
is cleaning |
B． |
was cleaning |
| C． |
has cleaned |
D． |
will clean |
Did you pass the test？
Yes．I'm very _____ for your advice．（ ）
| A． |
thankful |
B． |
careful |
C． |
useful |
D． |
helpful |