删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

    I hardly remember my grandmother. She used to holding me on her knees and sing old songs. I was only four when she passes away. She is just a distant memory for me now.

    I remember my grandfather very much. He was tall, with broad shoulder and a beard that turned from black toward gray over the years. He had a deep voice, which set himself apart from others in our small town, he was strong and powerful. In a fact, he even scared my classmates away during they came over to play or do homework with me. However, he was the gentlest man I have never known.

罗斯福新政中，既直接提高就业率，缓和社会矛盾，又为经济发展开拓空间的措施是

1891年德国动物学家亨金，通过对多种生物的观察研究，证实了在形成精子或卵细胞的细胞分裂过程中，染色体都要减少____ ，每对____ 中各有一条进入精子或卵细胞。

用方框中所给单词的适当形式填空。每词仅用一次，每空一词。