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            • 1．

              Many foreigners find it difficult for them to learn how to use chopsticks skillfully in China.

               → Many foreigners have trouble ______ ______ how to use chopsticks in China.

              难度：较易
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            • 2．

              Immediately he finished his studies, he started travelling in China.

               __________ __________ his studies, he started travelling in China.

              难度：较易
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