The environment is crucial in our life and the government should take some actions to protect trees.
The car was quite old，yet it was in excellent condition.
We have got to study hard，to enlarge our scope of knowledge，to realize our potentials and to play for our life. It was then that I realized the importance of learning English.
The public transportation is improved，so that it is convenient for citizens to travel around.
Only when the government improve the public transportation is it convenient for citizens to travel around.
Only by this means can we make is better sooner or later.
The pie chart illustrates the average way in which foreign students spend their money over the course of a week，learning in America.
People travel to the place to which they can broaden their visions.
Citizens live in the place in which they can improve their life.
The government take some measures for environmental protection for which people can breath the fresh air in daily life.
The government spend more money on the railway station on which people can travel easily between cities.
The government taking some measures to improve the road system，people can travel travel easily between cities.
It is when the government takes some measures to improve the railway system that people can travel travel easily between cities.（时间状语从句）
It is where they arrive that poeple can learn much more knowledge.（地点状语从句）
It is because the government improves the public transport that people can travel travel easily between cities.（原因状语从句）
It is as if they never existed that some people completely ignore these facts.（方式状语从句）--as if【仿佛】翻译：一些人完全忽视了这些事实，就仿佛它不存在似的。