It’s a common scene in the film Tangshan Earthquake that families cry helplessly over _____ is left of their homes.
Once out of the earth’s gravity, the astronaut is by the problem of weightlessness.
The doctor telephoned to say that he couldn’t ____ the meeting because he had to ___ a patient.
When we are in a new place, we must __our manners and try to follow the customs of the place.
In the early morning all of us stood at the top of the mountain __ east of the city, watching _____burning sun rising.
The boy was led ___while crossing the road.