Our school has used computers in teaching for ten years. As a result, not only______, but students become more interested in their lessons.

Only if enough evidence is discovered _______ in the existence of the monster.

The door opened and there    .

―What’s Apple’s attitude toward the matter?―Apple does not look into the matter directly, ______.

So necessary _____ it to learn about their customs that I will attend a special lecture next  week.