To keep children away from danger，we warn parents ________ children at home alone．（ ）
A．leaveB．to leave
C．not leaveD．not to leave
Did you call Fred back？
I didn't need to， I'll see him tomorrow．（ ）
| A． |
because |
B． |
unless |
C． |
when |
D． |
though |
That's all I have to say．Is there anything you'd like to ？（ ）
| A． |
talk |
B． |
require |
C． |
hold |
D． |
add |
Is it OK if I sit on this chair？
Sorry． （ ）
| A． |
Here you are． |
B． |
Take it． |
| C． |
Not at all． |
D． |
It's taken． |
If there's a lot of work ，I'd like to keep on until it is finished．（ ）
| A． |
do |
B． |
to do |
C． |
done |
D． |
doing |
Hi，Mary．You look
Yeah，I'm going to America with my parents for a vacation．（ ）
| A． |
kind |
B． |
moved |
C． |
excited |
D． |
sad |