题目

根据句意，用所给单词的适当形式填空。【1】Uncle Sam was happy to have his second child in his __________(forty).【2】Qian Xuesen is an excellent scientist with great ____________(achieve) in his life.【3】There is no clear ____________(divide) line between the two areas.【4】No school team invited them to play basketball ___________(simple) because of their heights.【5】You are getting fat, you’d better pay attention to ______________(control) your weight.一个球从高为6米的地方自由下落，每次着地后回弹高度为原来的高度的13，到球停在地面上为止，则球经过路程的总和为______．