文本：
Lesson 7 Sit
last words made me sit up.
's sitting on two chairs.
's no good sitting on the fence.
't sit on my suggestion.
5.I'm sitting on the thorns.
's no time to sit back.
's sit down and talk about it.
't sit up too late watching TV.
Lesson 8 Save
saved my life.
might as well save your breath.
're only saving your own skin.
will save you a lot of trouble.
saved my face.
may save your pains.
a seat for me.
8.I'll save it for important occasions.