根据课文原文，填入所缺内容。

1. The most energetic and important festivals are the ones that _________________the end of winter

and to the coming of spring.

2. Something terrible __________________if Li Chang was not coming to eat in his restaurant as he

always did.

3. The next morning I'd just about given myself up for lost when I ___________by a ship.

4. This produced a chain reaction, which _______________for life to develop.

5. That afternoon aboard the train, the cousins _____________in their seats.

简述电视声音的功能。