若N=（a•a²•b³）⁴，那么N等于（　　）

A．a⁷b⁷

B．a⁸b¹²

C．a¹²b¹²

D．a¹²b⁷

根据首字母完成单词。

1. Gina wants to j ________ the music club.

2. Can you s ________ English?

3. My sister plays the g___________ very well.

4. Please help me w               my math ,it’s a little bit difficult for me.

5. Let’s p               football.