根据句意及首字母提示写出所缺单词。

1. He was so t _____ the night before his examination that he couldn't sleep.

2. Have all the guests been s _____ with food and drinks?

3. The new shoes are c _____ to wear.  I like them very much.

4. — What do you think of the fish?

    —It t _____ really delicious.

5. Some advertisements tell the t _____ and some don't.

劲度系数为k的轻弹簧，上端固定，下端挂一质量为m的小球，小球静止时距地面高度为h，此时弹簧长度L＞h．现用力向下拉球使球与地面接触，然后从静止释放小球，若弹簧始终在弹性限度内，则球运动到最高点时离地高度为______，加速度大小为______．