Knowing the result of the exam, he went home and lay in bed,          .

From his ________ voice on the phone I know everything is going under way.

The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.

In the history of Chinese revolution, Taierzhuang Battle was a ________ battle in which both sides suffered heavy losses.

All of the students were_______ by the ________ speech given by the headmaster.