. The temperature can fall to –50°._____ is, 50°below freezing point.
The careless man received a ticket for speeding . He ____ have driven so fast .
It was not until I came here _______ I realized this place was famous for not only its beauty but its weather.
Most Jewish families ________ many difficulties during the Second World War.
As is reported, it is 100 years ________Qinghua University was founded.
It’s bad manners to keep _______ when your teacher asks you a question.