Question

--- How do you usually come to school?

--- ________.

1. A.
   By bikes
2. B.
   By a bike
3. C.
   On my bike
4. D.
   On bike

Answer 1

C
介词by后直接加某种交通工具，交通工具不需加任何冠词或变复数，因此，此题选on my bike。