B.用于it is+形容词或过去分词+主语从句中，这类形容词或分词有：
advisable明智的，合理的decided决定的crucial关键的
appropriate恰当的determined决定的commanded命令的
arranged安排的essential紧要的，基本的complied遵照
anxious焦急的imperative迫切的important重要的
desirable合意的better较好的，更好insistent坚持的
desired想要的asked请求keen渴望的
incredible难以置信的adamant坚定不移的natural自然的
insisted坚持的necessary必要的suggested建议
urgent紧迫的ordered命令shocked震惊的
vital极其重要的possible可能的strange奇怪的
preferable好一点proposed提议proposed提议
requested要求的required要求的recommended推荐
resolved决定的probable可能的pity可惜，憾事
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