下面短文中有10处语言错误，请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏词符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（﹨）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：
1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第11处起）不计分。
Dear Grandpa,
How are you these days? I have been missing you very much after I went to college a year ago. Whenever I think of the old days, I feel very happily. I still remember when I was a child, you always held me in your arms and told me stories till I fall asleep. We often went to the fields to enjoy the pleasant view there. You told me the name of different plants and characteristics. Gradually, I became interesting in biology and chose to learn biology when I entered into the college. Now my friend Ann, together with me, are going to do field study and the findings will be use as materials for our research. Since we’ll do the study in our hometown,so I hope to see you then.after—since
网友回答
(答案→)after—since
解析：
【小题1】after—since 根据前句的时态have been说明是从过去的时间开始以来，故使用since.
【小题2】happily—happy 系动词feel后面接形容词happy做表语。
【小题3】fall—fell 本句的时态是过去时。
【小题4】name—names 后面指不同的植物，故用不同的名字。
【小题5】characteristics 前加their 指这些植物的不同特点。
【小题6】 interesting—interested 对做人的主语进行说明使用interested.
【小题7】enter into the college- 去掉into enter是及物动词，直接加宾语，不要介词。
【小题8】are going to do--is going to do 和主语Ann保持一致，用单数。
【小题9】 use—used 本句是被动语态，被用来做某事。
【小题10】去掉so 前面已经有了连词since，后面就不需要so。