3. If I tell a bad joke does it make you split your sides or groan?

If you hear a bad joke you groan, which means to laugh awkwardly or in a forced way.

4. How do you make a rat laugh?

You tickle a rat to make it laugh.

5. True or false? The part of the brain responsible for speaking is newer than the part used for laughing.

True. The part of the brain used for laughing is an older part we share with other mammals. 

2. 请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处 。

1. I can't stop giggling whenever Tim talks. He's just so funny.

2. He backed up his claim with photographic evidence.

3. After running for 10 miles I was wheezing heavily.

4. Don't you dare say that again or you'll be laughing on the other side of your face.

5. Police were sent in to deal with a threatening situation.

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