-You seem to know little about Yancheng Middle School. Aren’t you a teacher here?-No, but I ________.
The tomato juice left brown ____ on the front of my jacket.
Most of the professors _____ to our school were from South Africa.
—Alice, you look puzzled.Haven’t you understood it? —Yes.I _____of another problem just now.
By looking at a problem in as many ways as possible, creative thinkers can find solutions that would _______ remain invisible.
—What do you think of the performance today?—Great! but a musical genius could perform so successfully.