题目内容：

短文填空

根据下列短文内容，在短文后的空格处填上一个恰当的词，使短文完整、通顺。

One day, Mr.Black came back from a party very late. And the weather was very cold. There was   1.   bus or taxi, so he had to go home on   2.  .He held his 3. under his arm.

When he got home, he opened his bag. He wanted to take out his keys. They were always there. But he couldn’t__4.__them this time. He was worried and he didn’t know 5.  to do. When he looked up, he suddenly(突然地)saw his window(窗户)was open. Smiling to himself, Mr. Black thought of an    6. .

There was a ladder(楼梯)behind his house. He carried it to the window. Then he began to climb up the ladder. How dark it was! It was  7.  for him to do that, because he was afraid that he would fall down. So he was very careful.

A moment later he jumped into the house and he was very happy.But when he put his hand into his pocket(口袋),he was surprised to find his 8.  just right there..