Stephen Hawking believes that the earth is unlikely to be the only planet _______ life has developed gradually.
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A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _ many factors lead to the change．
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Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or later.
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There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.
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