It's already tens of years____the world's population reached five billion．（ ）
| A． |
before |
B． |
after |
C． |
since |
You can't pass the exam you study hard．
| A． |
if |
B． |
as |
C． |
for |
D． |
unless |
As we know，the Huanghe River is one of rivers in our country．（ ）
| A． |
long |
B． |
longer |
| C． |
longest |
D． |
the longest |
Whose T﹣shirt is this？Is it Sally's？
No，it isn't． is white．
| A． |
My |
B． |
Mine |
C． |
Her |
D． |
Hers |
I'm going to Ann's birthday party．Bye，mom．
，Jack!
| A． |
Have fun |
B． |
no problem |
| C． |
Best wishes |
D． |
Take care |
We planned to go shopping last night．Shall we go together？
Sorry．I prefer rather than in such a rainy day．（ ）
| A． |
to stay at home；go out |
| B． |
to go out；stay at home |
| C． |
staying at home；going out |
| D． |
going out；staying at home |