Rules and suggestions Unit 3 Language in use Language practice You must be careful of falling stones. You mustn't walk too close to the edge of the hill path because you might fall and hurt yourselves. You should always wear proper clothes. Bears might think our rubbish is food. Can we go rock climbing? No, you can't. Match the signs with the rules and warnings. No smoking. No eating or drinking. Children crossing. Danger! Be careful of falling rocks. Children should be taken care of by parents. Do not drink and drive.