By the time Jack returned home from England, his son _____from college.
—Jack, would you like to go to the cinema with me this evening? — ______ —I asked if you would like to go to the cinema with me this evening?
She was afraid __________ the dog in case it became dangerous.
_______breaks the law will be punished.
A sheep _____ on this kind of special grass usually grows much faster than ____on ordinary.
-When__________ and visit our exhibition next month? - When_______, I will let you know.