【推荐1】工人们坚持要求公司采取有效措施来改善他们的工作条件。
The workers insist that the company should ________ ________ ________ to improve their working conditions.

【推荐3】我们到了这样一个阶段：为了挽救我们自己，我们必须开始采取有效措施来保护环境。（抽象地点名词后接定语从句）（根据中文提示完成句子）
We__________ to protect the environment so as to save ourselves.

【推荐1】The number of people infected with HIV may reach 50 million by 2020 ________________ to prevent the spread of the disease. (measure)
除非采取有效措施来遏制传播，否则到2020年，感染HIV病毒的人数可能达到五千万。

【推荐3】It is so wet there that the trees are extremely tall, some __________ over 90 meters. 这里气候湿润，树木高大，个别树木测量高达九十多米。

【推荐2】Written Chinese has also become, an important means________ ________ China's present________ ________ ________ ________ its past.
书面汉语也成为中国现在与过去联系的重要手段。

【推荐3】They climbed up to a large rock. They got a good view from it. （用“介词＋which”引导的定语从句合并句子）
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