It'sfastandcheaptogotootherplacesbytrain.
It'sfastandcheapto【take the train】 togoto other places.

Moststudents go to school by bike.
Most students 【ride bikes】 to school.
用介词或副词填空：
They walked quietly and felt the beauty 【of】 the old park.
If you want to get there soon,you can go 【by】 underground.
The students in our class are friendly 【to】 each other.
What do you think 【of】 your best friend?
The 【length】 (long)of summer holiday in china is about 8 weeks
祝您学习进步,更上一层楼!O(∩_∩)O