题目

词与短语选择填空。 volunteer, control, raise, put off, used to, am used to 1.I         reading English aloud in the morning.It’s helpful to improve my English. 2.You should be in            of your time. Don’t waste too much. 3.We are making plans to          money for homeless people. 4.Never            till tomorrow what you can do today. 5.Why do they            to help others?15．如图所示，两水平放置的平行金属板与电源相连，其间一带电液滴恰好静止平衡．若将两板板之间的距离由d变为$\frac{3d}{2}$，液滴的加速度a=5m/s2．