—Who taught ________ to write the computer program?—Nobody. She learned it by __________.

—Mike , is that new bike  ________ ?—Yes. My mother bought it for me yesterday.

There are many trees on ________ sides of the road.

---Why did _____ take Aunt Alice almost an hour to get home ? ---I don’t know . Maybe there was something wrong with her car . 

Miss Li is_____ English teacher. We all like her very much.