非謂語動詞 動詞不定式：
    1. Mother told Mary ______ late for school.
    A. not to
    B. not be
    C. not to be
    D. did not be
    2. Pessimists warn us not ______ for pretty colors, since the car will come in gray.
    A. ask
    B. asking
    C. to ask
    D. to be asked
    3. Mrs. Black warned her son ______ after drinking.
    A. never to drive
    B. never drive
    C. to never drive
    D. never driving
    5. -Where do you suggest going? -We promised ______ the children to the West Lake.
    A. taking
    B. to take
    C. taken
    D. took
    6. A lot of people find modern art very hard ______.
    A. understood
    B. understanding
    C. to understand
    D. being understood
    7. They found the lecture hard ______.
    A. to be understood
    B. to understand
    C. for understanding
    D. to have been understood
    8. Would you like one ______ the radio a bit?
    A. turning down
    B. to turn down
    C. turn down
    D. turned down
    9. In order to get to Peter’s house easily, I had his secretary ______ a map for me.
    A. to draw
    B. draw
    C. drawn
    D. drawing
    10. Mrs. Wang made me ______ the work again.
    A. do
    B. to do
    C. doing
    D. raised