The fact that people are afraid to go out at night is often a result of perceived (感知) danger ________actual danger.
Since when has ____ been any of your business what I do?
We walked as fast as we could,____ to catch the 9:30 train.
—See the gathering clouds outside? Please take this umbrella with you. — .
Scientists hope to____soon in their fight against heart disease.
We haven’t heard from her for long, so we give her_____for dead.