25＋5=____
29－4=____
投出去的铅球在重力作用下沿曲线运动，说明力可以使物体的____发生改变；如果飞行中的铅球受到的所有的力突然消失，那么铅球将做____运动。
① How much is it? ____ A. OK. Here you are.
② Can I try them on? ____ B. It's $89.
③ Is it too expensive? ____ C. It's very pretty.
④ How do you like this skirt? ____ D. Yes，it is.
I'm Chen Jie. I don't go to school on the weekend. I often do my homework on Saturday morning. I play computer games on Saturday afternoon. On Sunday morning, I often read books and watch TV. In the afternoon, I help my mother do housework.
