A).根据句意和首字母提示每空填一个单词，使句意完整。

1. Fifteen minutes(分钟) is a q     . Do you know?

2. Are you f_______ this afternoon?       

3. Don’t worry. Let me h_______ you.

4. I can’t find my w         home. Could you help me?

5. The earth(地球) is our only h       .