• [A] He is Tom.
• [B] Hi.
• [C] How do you do
• [D] See you.
• [E] Thanks very much.
• [F] What’s his name
• [G] That’s all right.

Hello.

A．air is much more important to us than food and water
B．air is around us and we can’t live without it
C．air is as important to us as food and water

A．London
B．Washington
C．Tokyo