完型填空（仔细阅读上下文，从A、B、C、D中选出最佳答案共10分） Mr. Ellis is very old. He has seen____changes in his home town.He knows that things are different now. But he never forgets the old days. He likes to talk about them. Heoften talks about his favourite ___, the robins (知更鸟). "When I was a boy, these houses were nothere. There were wide fields and tall trees. Every spring the robins would come. Thousands of them would flyup to the north from the south. They spent the in the south. Some would build their nests (巢) in the near our houses. We knew it was spring when the robins came. When they left , we knew winter __ . “Then people building more houses. They cut down trees and they filled the fields ____houses. The robins stopped _ back. Oh, we’d seen some once in a while , but they couldn't find a right place their nests near our houses because there were no trees." "Now there are lots of houses and roads. There are no area for the robins. They do not comeany more, which is sad."