Switch off your mobiles
read the instructions
don't feed the animals in the zoo
clean your teeth
don't swim in tye zoo
don't talk ti strangers.
1. I have to tidy my room. 2. I don't have to do the cooking. 3. You have to study for the test tomorrow? 4. My older sister hasn't to go to bed before 11 o'clock. 5. My brother has to go to school on Saturday. 6. I haven't to get up early on Sunday.
1. Harmful chemicals
2. Critically pollution
3. Ozone layer
4. Fishing endangered
5. Air villages
6. Aerosol sprays