急啊！大家帮忙改个错！谢谢！是PETS英语卷上的题目
请帮忙改错。说的详细点哦 谢谢 题目： Spring has come to Portland at last.The sky is blue.Birds are singing on the trees,flowers are blooming,and everyone are in a good mood.Spring has always been a busy time with college students in Portland.They have to take final examinations and hand out their term papers.Most of students who have been living in the dorms will soon be packing their things to move back to home for summer vacation.Of course,many students will be looking for job during the summer and other students will remain in campus to take courses in summer school.
Spring has come to Portland at last。The sky is blue。 Birds are singing on （in中文说在树上，实际上是在密麻的树叶间，故用in） the trees,flowers are blooming, and everyone are (is,该用单数动词，all用复数动词) in a good mood。
Spring has always been (is always，原句也可，但表示一直以来同样的状况可用一般时态)a busy time with college students in Portland。They have to take final examinations and hand out their term papers。
Most of (the，限定词，具体指哪些学生)students who have been living in the dorms will soon be packing their things to move back to home (back home，删去to,该搭配可简单视为固定用法)for summer vacation。
Of course, many students will be looking for job during the summer and other students will remain in campus to take courses in summer school。
。
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