根据句意及首字母提示补全单词

1. I was so tired that I fell a_____ soon after I got home.

2. The shop is o_____ all day. You can buy something at any time.

3. Mrs. Wang is very kind. She often e_____ us to work hard at math, though it is hard for some of us.

4. It's n_____ twelve o'clock. Let's go for lunch together.

5. John can speak English and Chinese b_____ French.