按要求改写句子。

1. There are some new students in our class. (改为一般疑问句)

    ________ there ________ new students in your class?

2. I learn English by reading English stories. (对画线部分提问)

    ________ do you ________ English?

3. He spends two hours doing his homework in the evening. (同义句转换)

    It _______ him two hours to ________ his homework in the evening．

4. You can put your bike here. (改为被动语态)

    Your bike can ________ here.

5. 这个孩子还不够上学的年龄。(完成译句)

    The child is not ________ to go to school.

物体所受重力大小跟它的质量成______比．公式G=mg中g=9.8N/kg，它表示的意义是______；质量为60kg的木块放在水平地面上，则它受到的重力大小是______ N，方向______，我们知道物体在月球上受到的重力等于地球上所受重力的