The expressions they use might whom they are speaking to or how well they know each other.
__________! There comes a train!
The car runs ___ a very high speed and directly hits the tree beside the street.
The old man ___ a blue sweater is our new headmaster.
___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.
This beautiful skirt ____________ of cotton. A. is made from B is made of C. makes from D. makes of