按要求改写句子
Ted is old. Mark is older than Ted. Fred is older than Mark. (合并句子)
Fred is the ________ ________ all the three.
We will plant more trees so that we can improve our environment.  (改写同义句)
We will plant more trees ______ ______ to improve our environment.
Diana made great success in her research because she put her effort into it.  (改为简单句)
Diana made great success in her research ______ ______ her effort.
Kevin will take a holiday to France the week after next. (用two weeks ago改写句子)
Kevin _________ a holiday to France two weeks ago.
I spend half an hour doing morning exercises every day.(改为同义句)
It _______ me half an hour to _______ morning exercises every day.