The river has become much ______ than before because of the waste water from the factories.A. dirty B. dirtier C. Dirtiest
—Oh! I came to school in such a hurry and forgot to bring any books with me. —Never mind. You can use ________.
His grandfather ________ for seven years.
—Is Miss Tian in hospital because she has a sore throat? — . I saw her in the school just now.
I don’t think there is _______ with the computer.
I went to the zoo yesterday. It me two hours there by subway.