1．选词填空。
A.and B.kangaroos C.three D.they E.saw
F.thought G.outside H.jye.ai I.problem J.jye.ai't
One day，the workers of a zoo got together and had a meeting.They had a （1）
.The kangaroos often ran out of the cage（笼子）.They（2）
the kangaroos ran out because the cage was too low.So they raised（升高）it from one metre to two （3）
high.But the next day the （4）
were outside again.Then the workers raised the cage to（5）
metres.But the next morning，they（6）
the kangaroos everywhere（7）
the cage.The workers were very angry（8）
raised the cage to ten metres.They thought the kangaroos（9）
run out again.One day，a giraffe asked a kangaroo，"Do you think（10）
will continue（继续） raising the cage？" "Maybe!" said the kangaroo，"if they continue forgetting（忘记） to close the door of the cage."