Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _____ introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks.
21st Century is ______ a newspaper; it helps us know a lot about the world.
Rather than_____ on a crowded bus , he always prefers______ a bicycle.
My plane at 8:30 am, so Ihome at 8:00 tomorrow morning.
The number of people present at the meeting ________ about 1000, a large number of whom ________ experts from abroad.
---Mike, please don’t forget to turn off the light when you leave. ---Pardon? ---I ________ forget to turn off the light.