_________ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
35. —What’s that noise? —Oh, I forgot to tell you. Your bike ______.
34. English is considered as a(n) _______ language, and it is no surprise that there are so many people in the world learning it.
33. —We want to sit at the table near the door. —I’m sorry, but it _______ already.
32. It is reported that the scientists in our country are ______ all possible ways to control H1N1 flu.
31. Look at the notice. You are not allowed _______ the gymnasium without permission.