When her parents weren't at home，she took care ofyour sister．（ ）
| A． |
look for |
B． |
cared for |
C． |
look over |
D． |
look after |
I saw Sam and David in the playground yesterday afternoon．They____games with their classmates then．（ ）
| A． |
play |
B． |
will play |
| C． |
are playing |
D． |
were playing |
For our own safety，it's important to ______the traffic rules on the way to school．（ ）
| A． |
follow |
B． |
change |
C． |
make |
D． |
break |
Don't hurry him．You will just have to be____and wait until he finishes the work．（ ）
| A． |
active |
B． |
careful |
C． |
patient |
D． |
famous |
﹣﹣﹣Look at the stone bridge！Do you know____it was built？
﹣﹣﹣In the 1860s．It is quite old．（ ）
| A． |
when |
B． |
how |
C． |
where |
D． |
why |
Please don't make so much noise．I_____hear the speaker very well．（ ）
| A． |
needn't |
B． |
mustn't |
C． |
can't |
D． |
shouldn't |