—Can you describe ___ it happened?—Yes, I was riding on my bike ___ a car knocked me down from behind.
. –Have you finished designing a dress? --________ finished but there’s still something to improve.
The population of many Chinese cities has _________ doubled in the past 30 years.
You can’t ________ her in knowledge of classical music.
The scientists are now trying to discover that use could be _________ such material.
The idea puzzled me so much that I stopped for a few seconds to try to _________.