质量都是m的物体在水平面上运动，则在下图所示的运动图像中表明物体做匀速直线运动的图像的是

用适当的情态动词填空。

1. _____  you like to share a room with

    your sister?

2. Mum said to her baby" You _______   not  eat so many candies. "

3. — You have so much work to do. _____.

    —  you like me to help you?

    — No, thanks.

4. — ______ I finish the job tomorrow?

    — No, you needn't.

5. — Could I use your computer?

    — Yes, you _____.

6. — Need I go there with you?

    — Yes, you _____.