You ought to have put the milk in the refrigerator, and now ________sour.

Did you see who the driver was?—No, the car ran so fast _____ I couldn’t get a good look at his face.

do you write to your parents?— Once a month. [ ]

_____haveyou practiced skating? —For five years.[ ]

My family______watching TV in the sitting room now．My family_______a big one．