现在是早晨，Sarah去Mr Black那儿看病，她应该说：
| A．Good morning，Mr Black. |
| B．Good afternoon，Mr Black. |
| C．What's your name？ |
| D．Who are you？ |
Leaves must ____________ green to make food for plants and trees.
A. is
B. be
C. are
They ____________ sunlight，air，and water.
A. need
B. needs
C. needes
What do they need ____________ food?
A. to make
B. make
C. making
—____________ is it?
—It's yellow.
A. Which color
B. What color
C. What
I'm really sad because I ____________ my bike.
A. use
B. lost
C. loses