根据句意及首字母或汉语提示写出单词。

1. You should be honest at any time. We don't like the people whoalways tell l___.

2. ____(好奇心)is a sign of the desire to understand the world    around us better.

3. You should give us a____(折扣)for such a large quantity.

4. Taking exercise is one way of keeping  (苗条的).

5. I was twelve,and staning to put on w_____ and grow tall.

6. Since he knows he is doing something wrong,he o____ to  stop at once. Why wait till next year?

甲、乙两个实心球．甲的体积大于乙的体积，有关甲、乙两球的质量和密度的关系，可能存在的情况有__________________________________________________________________________________________________________________________．(写出三种)