根据所给的汉语写出单词，使句子意思完整正确。 51. Our classroom isn

根据所给的汉语写出单词，使句子意思完整正确。

51. Our classroom isn’t as clean as     ▲     (平常) after exams.

52. It’s such a    ▲   (令人愉快的) trip that I will remember it for ever.

53. The final-term exam is coming soon. The students are busy    ▲   (准备)for it.

54. Amy is such a clever girl that she learned to cook by     ▲     (她自己) at 8.

55. In my school, students not only work hard, but also take part in all kinds of    ▲   (活动), such as dancing, drawing, reading and so on.

56. The old woman prefers     ▲      (步行) to jogging.

57. Science is one of my favorite     ▲      (科目). What about you?

51. usual   52. pleasant  53. preparing 54. herself  55. activities   56. walking   57. subjects