A．Don't feed the animals.  | B．Don't touch the animals. |
A．Don’t litter, Tom.  | B．Don’t throw stones. |
A．Please be quiet.  | B．Don't cry. |
| A．Don't litter. | B．Don't throw stones. |
| A．Thank you! | B．You’re welcome! |
| A．What’s ten minus three? |
| B．It’s seven. |
| C．That’s right. |
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