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(三) 背景资料 某机电安装工程项目，业主通过公开招标方式选择了某机电安装企业，双方签订了机电安装工程施工总承包合同，施工总承包企业又选择了一家劳务分包企业，将某分部工程的劳务作业分包给该劳务分包企业。在施工过程中发生如下事件。 事件一：由于业主供应的工程材料延误，使劳务分包企业停工待料，劳务分包企业直接向业主提出延长工期的要求。 事件二：施工过程中，业主要求增加工程量，经项目经理同意后，双方签订变更合同。 事件三：某分项工程，监理工程师指令变更合同。因为变更涉及工程价款的变化，机电安装企业在变更后的第25天向监理工程师提出变更价款的报告。 事件四：该机电安装企业为了预防合同风险，向当地保险公司投保了工程一切险。 问题： 1.事件一中，劳务分包企业是否可以向业主提出工期延长的要求？说明原因。 2.事件二中，施工合同变更的程序是否正确？如不正确，请说明正确的做法。 3.事件三中，监理工程师是否会批准变更价款报告？并说明理由。 4.合同风险的因素有哪些？合同风险的防范主要有哪些方面？事件四中是运用的哪方面来预防风险的？
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