Choose the correct answer.

28. No one seems to care about the environment, ____________ ?.

29. Do you know where ____________ a book about insects?

30. The new law prevents people ____________ their rubbish in certain areas.

31. Let's walk to the shops instead of taking the car, ____________ ?

32. There isn't much point in trying to save electricity, ____________ ?.

33. Don't drop your sweet wrapper on the floor, ____________ ?

34. 'I went to the exhibition at the natural history museum.'
'Oh, yes? What ____________there?'