Measures have been taken to clean up the lake,but it will be..

Measures have been taken to clean up the lake,but it will be some time________the situation improves. [ ]A. althoughB. beforeC. unlessD. when

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— What was the party like?— Wonderful. It’s years _______..

— What was the party like?— Wonderful. It’s years ________ I enjoyed myself so much. [ ]A. afterB. whenC. before D. since

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I’ll never forget such a beautiful place _____ I spent my c..

I’ll never forget such a beautiful place _____ I spent my childhood there with my grandparents.[ ]A. becauseB. whereC. whichD. when

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_____ it's a little bit hard for some of us to imitate the ..

_____ it's a little bit hard for some of us to imitate the standard English accent, we still communicate with foreigners very well.[ ]A. As ifB. Even ifC. Now thatD. As long as

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She had just finished her homework ________ her mother asked..

She had just finished her homework ________ her mother asked her to practice playing the piano yesterday. [ ]A.whenB.whileC.afterD.since

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