27. Large sums of money (ought to keep) in a bank, didn’t you think?
28. At our high school, the students’ grades (send) to their parents four times each year.
29. I’m sorry, but the computer job is no longer available. A new programmer (hire, already).
30. Household cleaning agents (must use) with care. For example, mixing chlorine bleach with ammonia (can produce) toxic gases.
31. What products (manufacture) in your country?
32. Aluminium is a valuable metal that (can use) again and again. Because this metal (can recycle), aluminium cans (should throw away, not).
33. Endangered wildlife (must protect) from extinction.
34. People with the moral courage to fight against injustices (can find) in every corner of the world.