根据句意 ,用所给单词的适当形式填空 .

1. Maria tries __________ (drink) milk every morning.

2. Here are some __________(photo) of my family.

3. Billy goes to the beach with his friends three __________ (time) a month.

4. If you want to keep healthy, you should eat a __________ (balance) diet.

5. __________ (read) in bed or in the sun is bad for your eyes.

6. New Year's Day is very important in some __________ (west) countries.

7. It usually takes me about half an hour __________ (walk) to school.

8. Thanks for your __________ (invite).  I'd love to go to your birthday party.

9. Teddy has a __________(healthy) lifestyle than the other students in his class.

10. My proper ways of studying English help me get good __________ (grade) in exams.

如图所示，物块A、B静止在光滑水平面上，且，现用大小相等的两个力F和F^/分别作用在A和B上，使A、B沿一条直线相向运动，然后又先后撤去这两个力，使这两个力对物体做的功相同，接着两物体碰撞并合为一体后，它们                 （   ）

A．可能停止运动      B．一定向右运动

C．可能向左运动      D．仍运动，但运动方向不能确定