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.
