| A．Not worry. |
| B．Don’t worry. |
| A．It’s very nice to you. |
| B．It’s very nice of you. |
| A．It’s very nice of you. |
| B．I can help you. |
| A．Do you have a science class this morning? |
| B．Do you have a computer class this morning? |
| A．May I use your science book? |
| B．Give me your science book. |
| A．I like science book. |
| B．I like science class. |
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