6. a while back 不久以前
We had a good rain a while back,but we need more now.
7. all along 一直
I knew it all along.
8. anything but 绝对不
I was anything but happy about going.
9. account for 解释
How do you account for it?
10. after all 到底
A: I’ve just seen the X-rays and your teeth look just fine.
B: I see. Then there is nothing to worry about after all.