—How many workers are there in your factory, Mr Brown?—________ workers in our factory _________2000.
Could you please send _____ a doctor? My mom is ill.
It is not easy to tell the True _____ the False in the English reading.
I have tried so hard but _____ I get nothing.
This famous drawing is sold ____ 10,000,000 dollars.
I can hardly work out the answer _____ this difficult question.