Spring has came to Portland at last. The sky is blue. 【M1】______ Birds are singing on the trees, flowers are blooming, and 【M2

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问题     Spring has came to Portland at last. The sky is blue.  【M1】______
Birds are singing on the trees, flowers are blooming, and  【M2】______
everyone are in a good mood. Spring has always been        【M3】______
a busy time for college students in Portland. They had     【M4】______
to take final examinations and hand out their term papers. 【M5】______
Most of students who have been living in the dorms         【M6】______
will soon be packing their things to move back to home     【M7】______
for summer vacation. Of course, many students will be      【M8】______
looking for job during the summer and other students will  【M9】______
remain in campus to take courses.                          【M10】______
【M2】

选项

答案on—in

解析 在树枝上唱歌,可以看出在树的范围以内;而on则表示树本身的物体,这里用in。
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