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________ is known to all is that effective measures should be taken to deal with the problem of the over­exploitation of our resources.

(2013·日照二模)The government should consider ________ people and the environment will be affected before they make decisions.

(2013·臨沂二模)________ is often the case with old people, my grandfather is fond of doing morning exercise.

His pale face suggested he ________ angry and I suggested that he ________ at once.

(2013·陜西西北工大附中一模) ________ a little earlier, you could have got a copy of his latest book.

Nothing that you say can change his mind, ________？

The smoggy weather has made us realize ________ terrible problems we are faced with.

—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is ________ is troubling him.

(2013·甘肅河西五市一模)Look! The ground is wet. It must have rained last night, ________？

Sarah Brightman, ________ will fly to space in 2015, is the first woman to fly there in the field of music.