__________ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal.
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.