问题
填空题
根据句意及首字母提示完成下列句子。
1. Columbus d _____ America in 1492.
2. Gradually a smile a _____ on her face.
3. We should protect e _____ animals.
4. Some of the swamps have become p _____ .They are dirty now.
5. It's popular for city people to spend their vacation in the village with the v _____ .
答案
1. discovered 2. appeared 3. endangered 4. polluted 5.villagers