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1. _ (我正要给 Tom 再次打电话时) he called back.（about） 2. He is _（这么聪明的孩子）that all of us like him. (so) 3._（正在修建的那座桥） across the Changjiang River will be the first one for four trains to pass at the same time. 4._（我碰巧在现场）when the accident happened. (spot) 5._（尽管他是个孩子）, he behaves like an adult. ( as) 6.Do you know _（他们认识多久了）before they got married? (know) 7. Do you wash the clothes yourself or _（请人洗衣服）？ 8. _（哪儿有水），there is life. (there) 9. _（要不了多久） we know the result of the examination. (before) 10. The police are searching for the murder _（狗在前带路）. (with; lead)