Are those____keys， Jack？
No， they aren't． They're Uncle____．（ ）
| A． |
yours；Sam′s |
B． |
your；Sam |
| C． |
your；Sam′s |
D． |
yours；Sam |
Is this Alice's bike？
No， is under the tree． She put it there this morning．（ ）
| A． |
she |
B． |
her |
C． |
herself |
D． |
hers |
Yesterday our teacher saidwe should hand in our homework on time． The underlined word
is pronounced as ．（ ）
| A． |
/si：d/ |
B． |
/sed/ |
C． |
/seid/ |
D． |
/said/ |
The air pollution is a serious in our country． Our government is trying to solve it．（ ）
| A． |
choice |
B． |
program |
C． |
problem |
D． |
opinion |
It's fine today． Let's go out for a walk．
（ ）
| A． |
What a surprise! |
| B． |
That's a good idea! |
| C． |
Have a nice day! |
| D． |
I'm not sure about that! |
Hawking's book A Brief History of Time came after years' hard work．（ ）
| A． |
out |
B． |
on |
C． |
down |
D． |
up |