C. 16. We should use energy efficient appliances so that we can save energy.
17. I phoned Carlos to ask him to come to the concert with me.
18. I take showers in order to reduce water consumption.
19. I am studying hard so that I can get a place at university.
20. Ann made a bird feeder so that birds find food.
D. 21. You should see a doctor.
22. I think you should take an umbrella with you.
23. He might start looking for another job.
24. You don't have to buy a newspaper.
25. They have to wear a uniform.
E. 26) F 27) C 28) B 29) D 30) A
