Columbus is known for the great discovery ____ a new land-America.
When she finished her story, none of us said anything about it, which made her feel rather ________.
E-mail, as well as phone calls, _____________ an important part in daily communication.
If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.
------- How can we __________ to a changeable environment?-------- By constant study and changing our ideas.
----- How did you find _________ long talk given by the headmaster on ___________ Teachers’ Day? -------- Boring. I’d rather he had made it short.