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9．Birds aresinging（sing）．Their beautiful sounds make people happy．

分析鳥兒們在歌唱．他們優美的歌聲使人們快樂．

解答答案：singing
根據該空處在句中作謂語故填入動詞的正確形式，結合下文Their beautiful sounds make people happy．"他們優美的歌聲使人們快樂．"可知該句強調的是正在發生的動作故確定為現在進行時態，其結構為is/am/are+現在分詞，結合空格前有be動詞are，故填入謂語動詞sing的現在分詞即可，故答案為：singing

點評本題考查用所給單詞的適當形式填空，首先要根據語境明確句意，然后再根據相關語法對所給單詞在形式上做出正確的變化．

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