Let's learn to use the problem we are facinga stepping-stone to future success.
“Do you have any clothes ___ today, Master?” asked the servant politely.
The old professor has such a bad memory that he looks for the watch while he is ___.
---Will you go to the Great Wall with us? ---If John wants to go, ____.
The old man ___ all his money.
This is the museum ___ we visit yesterday.