根据汉语意思，完成句子。

1. 五加三等于八。

    Five plus three _____________ eight.

2. 知识就是力量。

    Knowledge _____________ power.

3. 他每天晚饭后散步。

    He _____________ a walk after supper every day.

4. 地球是圆的。

    The earth _____________ round.

5. 她每天都帮助妈妈干家务。

    She _____________ her mother do the housework every day.

—I must look after my mother at home. She gets a stomachache.

—______ Can I help you?

—That's very kind of you. But I can manage it myself.