六、用括號內(nèi)所給動詞的正確形式填空(共5小題;每小題l分，滿分5分)
49.I didn’t know how ______________(teach) children when I started to work in a primary school.
50. --Why didn't you come to open the door for me?
---I (wash) dishes in the kitchen and didn't hear the doorbell.
51. My computer fan doesn't work. Where can I have it_________ (repai r)?
52. I don't think he stole the painting. When he__________ (ask) what he was doing at 7 yesterday evening, he was very calm.
53. --Is there any mistake in your homework, Jim?
--I'm not sure. I (not check) it carefully.
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