— Our team is going to play with the Rocket. I'm sure we will win.

— ________. [ ]

A. Congratulations

B. Cheer up

C. Go ahead  

D. Good luck

阅读课本Unit 7《Enioy Your Hobby》的这封信，回答下列问题。

1. Who did Brain write to？

    ___________________

2. Did he want to get back the stamp on the letter?

    ___________________

3. What does their teacher say?

    ___________________

4. What is Jenny's idea?

    ___________________