| A．Excuse me. | B．Of course. | C．Watch out. |
| A．Come on. | B．Be careful. | C．Thank you. |
| A．Don’t play in the street. It’s dangerous. |
| B．Don’t run on the stairs. You may fall down. |
| C．Don’t climb tall trees. You may fall down. |
| A．hurt yourself | B．fall down | C．get sick |
| A．You should | B．Do | C．Don’t |
| A．to | B．for | C．with |
| A．climb | B．climbs | C．climbing |
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