45. The scientist is working on the       (研究) about Chinese tea.

44. Many       (野生的) animals don't have a safe place to live.

43. English is my favourite subject,and I like it       (good) .

42. It's difficult for pandas        ( have ) babies.

41. Giant pandas are in        (dangerous) because people are taking away their land.

40. The number of tigers       (get) smaller and smaller now.

39. Wo must do something        (help) the giant pandas.

38. The bamboo forests are getting       (small) today.

37. II suddenly thought of a way       (save) water.

36. Tony is one of the       (tall) students in our school.