A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
“You ___ to think for youself , you are to carry out my orders.”
“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.