P13 3-2 二、听录音，根据所听句子完成各题。

1. David is outgoing, but his brother Dave is serious. 

2. Tina’s sister sings more loudly than her. 

3. Jane works as hard as her brother. 

4. Tom is smarter than me, but I think he should work hard. 

5. Cindy is nicer than me. She dances better than me, too.