根据括号中所给的汉语写出单词，使句子意思完整正确。

67. Don’t make any noise. The baby is          (睡着的) in the next room.

68. When you answer your teacher’s question, you should speak as          (清楚地) as possible.

69. I live on the          (第二十一) floor of a tall building in the centre of the city.

70. Last Saturday evening all of us enjoyed          (自己) at Sue’s birthday party.