worth
值……的价值   

例句：
What is it worth? / How much is it worth?
它值多少钱？

have a ball
过得很快活，玩得很高兴
 
例句：
The picnic was fantastic, we had a ball!
野餐棒极了，我们玩得真痛快！

What are you up to?
你在忙什么呢？ 

对话：
A: Jack¹, I can't go with you to the movie tonight.
B: Why? What are you up to?
A: I guess I have to bone up for my English test Friday.
　　　
A：杰克，今天晚上我不能和你一起去看电影了。
B：为什么？你在忙什么？
A：我猜我得准备星期五的英语考试了。