Tony, ______his father, ____ walking from home to school.
—Have you________visited the old house by the river? —No,________.
Nowadays________of business letters are written in English.
—Have you ever been to Shanghai? —Yes.I________there a few months ago. A.have been B.went C.have gone
—Would your younger brother go for a picnic this Sunday? —If I don’t go,________.
It’s said that________of the water around the world________polluted.