1 . 根据句意，选择单词或短语并以其适当形式填空。

belong to; contribute to; in case; in the distance; a variety of

1. People change their mind for ________reasons.
2. The figures ________ seemed to be drawing closer.
3. Extra boiling water should be kept at hand just ________  it is needed.
4. You can’t take away these magazines which ________ our school library.
5. On the social level, improvement in the quality of life can ________ social harmony greatly.