The changes of the plants and animals in an area ________ from differences in climate and the           nature of the country.

— This is Tom speaking.— Oh, it’s great. But I ______ your voice just now.

It is said that the book _________ many events that can’t be found in other books.

—Did you find the missing couple in the mountain yesterday?—No, but we ______ to get in touch with them ever since.

As the war in Libya goes on, an increasing number of people in the country         from their homes and         a safe place to stay.