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填入适当的词。 1. I haven't heard from him_______ he went to America. 2.He won't be here_______ he is invited. 3. He will not go to the cinema______ he is very busy. 4. We found the key_______ she had left it. 5. We found the books two days ______he had gone away. 6. We had no sooner got to the station ________the train left. 7. He speaks English ______ he were an Englishman. 8.He is explaining clearly______ they can understand. 9. Do not leave the room______ you have finished the test. 10. She sang______ she went along.