根据所给汉语和句子意思,用英语补全句子.
1. Eating more fruit ______________________ (有益健康).
2. The exchange students from Australia are coming. Who ______(带领他们参观)our city?
3. When they got to the station ,the train _____________(已经离开)for 20 minutes.
4. Some of his advice _________________(值得采纳), I think.
5. Do you think ______________(有必要花)so much time writing blogs every day?