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It is not always easy ________ (refuse) invitations.

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She met with an accident on the way home. ________, she was not hurt seriously.

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He worked very hard last term, ________ he didn't past the final examination.

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Certainly he apologized to me. ________, I won't forgive him.

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The little girl can help her mother do a lot of housework ________ she's only seven.

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The USA is a superpower, ________ China is a developing country.

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The doctors tried their best to save the drowned boy. ________, they failed.

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but, however, interestingly, luckily, although, while, unfortunately

The two men chatted for a long time. ________, they didn't know each other at all.

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Many African children die at their early ages because of ________ and disease. (hungry)

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We must take strong measures against the serious ________. (pollute)