By the time I got back to school, the bell______.

Our country is teaching the young __________ should be true values of life by publicizing the deeds of scientists and real heroes.

In the face of danger, we need to stay ____. Only in this way can we come up with good solutions.

________ does your mother go to work— She usually goes to work in a car.

With the development of science, more new technologyto the field of IT