根據(jù)要求完成句子。

1．It took us three years to build the park．(變成同義句，每空一詞)

   We           three years         the park．

2．They are going to Australia by plane next week．(變成同義句，每空一詞)

   They are                      Australia next week．

3．I often go to visit my grandparents by train．(對劃線部分提問)

                   you often go to visit your grandparents?

4．Sam is ten years old．Jim is twelve years old．(合為一句)

   Jim is two years                      Sam．

5．Jim has to help his mother do the housework．(改為否定句)

      Jim                 to help his mother do the housework．