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【題目】We_______at the airport.Otherwise,we would have been here by lunch time.

【題目】So sudden ______ that the enemy had no time to escape．

【題目】Busy as the working mother is, she still_____ a lot of time to her children.

【題目】______ environmental damage is done，it takes many years for the ecosystem to recover．

【題目】You may have one of these；in other words，you may have ________you choose.

【題目】I have ______ all the papers but I still can’t find my notes．

【題目】_____ with so much trouble，we failed to complete the task on time．

【題目】The photo _____ taken by my brother last week is very nice.

【題目】The boy is so shy that he can't ________very well ________others.

【題目】Children are tired of learning often because they are________to do better than they can, both at school and at home.