句型转换，每空一词。

1. That is a backpack. (对划线部分提问)

    _______that_______ English?

2. Her pencil is green.  (对划线部分提问)

    _______ _______is her pencil?

3. My ping-pong bats are on the desk. (对划线部分提问)

    _______ _______your ping-pong bats?

4. Please call mike. His telephone number is 529-6403. (合为一句)

    Please_______ Mike_______ 529-6403.

5. These are Paul's friends. (否定句)

    These _______ _______Paul's friends.

高炉煤气使人中毒的主要成份是（）。