A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
Tom is senior _______ most other students in our class .
It was _____ he came back from Africa that year _____ he met the girl he’d like to marry.
Iraq has _____ too many wars, making people ______ a lot.
--- Have you _____ him to give up the job? --- Yes, I have. But he doesn’t listen to me.
Many questions ________ at the meeting, but he answered none.