用括号中所给单词的适当形式完成下列句子。每空格限填一词。

1. Mr. White lives on the_______ floor in that building. (five)

2. Walking in the space is one of the _______ of our time. (wonder)

3. Tom will study still _______ next term. (hard)

4. He is very careless, so he is _______ to be in charge of the experiment. (fit)

5. The plane landed _______ at last after flying in the storm for about one hour. (safe)

6. Have you ever seen how to _______ a cow? (milk)

7. Not everyone enjoys fast food. Jack is the one who _______ hamburgers. (like)

8. At the end of every year, some people go back to their _______ homes.(national)