Grammar
D Choose the correct item.

e.g. Never carry a second person ..........your bike.
A by B on C in

Be careful when you cross the street .................foot.
A in B on C by

When you travel ................ a bus, don't annoy others.
A on B from C at

Always wear a seat belt when you travel.............a car.
A at B on C in

It's safe to travel .................... train.
A in B on C by