My cousins have collected stamps for two years. They have ______ stamps from different countries.

 We shouldn’t be too crazy about learning English, but it is also too______to give up English classes in schools.

John once worked in a remote mountain village school, which is _____ only on foot.

It's said that __________ is going to give us a lecture.

Though the long-distance runner ______ his previous record last month, his trainer let him ______  its speed as he went around the curve.．