What is the model plane like?–Well, the wings of the plane are___________ of its body.

Nowadays people take___ exercise a day as they did in the past because of widely used automobiles.

_____ is the bike?—Just $150. [ ]

The light in his office is still on. Do you know _______?—To prepare for the material(材料) the meeting will need tomorrow, I think.

We go to school ____ our bikes every day. [ ]