— What do you think of the book? — Oh, excellent. It is worth __________ second time.
More children in Beijing will reach school age next year, ________ a shortage of primary school teachers in the capital.
It is necessary that we keep the young generation ________ of the current affairs.
Studies show that students often ________ to too much pressure tend to develop mental problems.
Under the environment of fierce competition, the only way John could imagine ________ stress was to get tougher by making greater efforts.
—Was it George who telephoned?—No. A man ________ himself Peter.