Few people realize the ________(significant) of the issue that the environmental problems have sprung up all over the world.
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The incident caused by misunderstanging has increased the ________(tense) between the two countries in the negotiation.
I was late in getting to the bus stop,but ________(fortunate) for me,the bus was late too.
________(mature) indicates one is lack of control and good sense in his behavior.
He could hardly bear the ________(lonely) of a desert island and he was trying to find someone to accompany him.