题目内容：

The weather Was-nice last Sunday, and Henry's familywent for a picnic.

Everyone was very hungry. They had a big lunch. They ate sandwiches and fruit. They drank milk and coffee. Everything looked good, and everything tasted good, too.

There were some black ants under the picnic table. They were hungry too.

Henry dropped a piece of bread. He dropped it under the table. The ants ate it.

Then his sister Mary dropped a piece of cake under the table. The ants ate that too.

Henry's family liked their lunch, and the ants liked their lunch too.

1.What did Henry's family do last Sunday?

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2.What did Henry's family drink?

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3.Where did Henry drop a piece of bread?

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4.Who enjoyed the lunch?

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5.What does the underlined word "that" refer to (指代) ?

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