在井下或管道内作业，能够使用过滤式防毒面具和隔离式供氧面具（）
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我就担心丧失机会。不抓呀，看到的机会就丢掉了，时间一晃就过去了。（）
A. The only thing I worry about is that we may lose opportunities. If we don seize them, they will slip through ’ t our fingers, time speeds by.
B. The only thing I worry about is that we may lose opportunities. Don ’ t seize them, they will slip through our fingers, because time speeds by.
C. The only thing I worry about is that we may lo se opportunities. If we don ’ t seize them, they will slip through our fingers. Now that time flies fast.
D. The only thing I worry about is that we may lose opportunities. If we don ’ t seize them, they will slip through our fingers as time speeds by.
箱涵顶进法施工时，在顶进过程中发生液压系统故障时，只要在做好安全措施的前提下才能够在工作情况下进行检查和调整（）
对话框除了有标题栏、控制图标等与程序窗口相同的部分以外，还可能111或多或少具有以下部分：若干命令按钮和五种类型的矩形框文本框，列表框，下拉式列表框，单选框和复选框（）
In Canada the federal governments have always been formed by ________.
A. the Liberal Party
B. the Progressive Conservative Party
C. either the Liberal Party or the Progressive Conservative Party
D. both the Liberal Party and the Progressive Conservation Party
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