Fleming discovered penicillin almost by______.
.According to the test disciplines it is_______ that any student takes a mobile phone into thee may examination room.
Is this school ______you have studied in for four years?
It was in this new hall _________ was just set up last month ________ we held an important meeting yesterday.
The problem was raised ________ we should get all the machines________.
—How did you find the film Curse of the Golden Flower? —__________. I can’t think too highly of it.