A:I often go for a walk.
B:I often go on a picnic.
—No, Mom. I did it very carefully.
—Which season do you like , summer or winter?
—I prefer summer.
将下列句子改为陈述句。
①像桑娜那样品德高尚的人难道不值得赞扬吗?
②为了把祖国建设得更强盛,我们怎能不努力学习呢?