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31. Look at the notice. You are not allowed _______ the gymnasium without permission.

32. It is reported that the scientists in our country are ______ all possible ways to control H1N1 flu.

33. —We want to sit at the table near the door.

—I’m sorry, but it _______ already.

34. English is considered as a(n) _______ language, and it is no surprise that there are so many people in the world learning it.

35. —What’s that noise?

—Oh, I forgot to tell you. Your bike ______.

36. —Was the guest’s speech interesting?

—Not at all. He was at a ______ and didn’t know what to say when others asked him questions.

37. No one has come up with a better explanation of why dinosaurs ______.

38. Eric taught folk music in a local school for one year, ______ he spent some time abroad studying jazz.

39. A huge forest fire ______ after the lightning struck, but luckily no one died or got hurt.

40. —William, what kind of music do you like, rap or jazz?

— _______. I prefer country music.