It’s required that the students______ mobile phones in their school, so seldom ______ them using one.

often pointed out, knowledge isa two-edged weapon which can be used ______ for good or evil.

esus, I can’t cut the durian into two halveshowever I tried!—Easy, boy! Why not use _______ knife

Look! The two brothers are arguing about what to do next. —Oh, well. In fact, the _____ brother’s idea is _________ the younger’s.

The news of his mother’s death was____ terrible shock to him