题目内容
Fill in the blank with suitable prepositions or adverbs.5. Though very busy with his work, he does mountain climbing once _____ a while with his friends.
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Fill in the blank with suitable prepositions or adverbs.6. This area witnessed a leap in economic growth in the past decade, but now the growth is slowing _____.
Fill in the blank with suitable prepositions or adverbs.7. Since you don’t know much about this city, let me accompany you _____ your hotel in case you lose your way.
Fill in the blank with suitable prepositions or adverbs.8. Leaving behind their families when getting _____ the plane departing for America is their most challenging experience.
_________主要用于隔离电源和不频繁地接通和分断电路。
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