用所给动词的适当形式填空
Look, there are so many people over there. What ____(happen)?
It's seven in the morning. It's time for us ____ (go) to school.
Look at the clouds in the sky. I think it____(rain).
____ (be) everyone here?  Yes, Let's____ (start) now.
He ____(be) be fifty years old next month. But he ____ (look) so young.
Teachers' Day____(come) . And we ____ (plan) to buy some flowers for Mrs. Li.
My mother usually ____(shop) for food on Sundays.

对联是中国特有的文学艺术形式，折射出了历史的沧桑巨变。阅读材料，结合所学知识回答问题。

材料一：民国二年，某地农村百姓家中春联：“帝德乾坤大，皇恩雨露深”。

材料二：1945年，在成都流传着一副对联：“中国捷克日本，南京重庆成都”。

材料三：1946年，某农村百姓家春联：“抗战胜利一元复始，和平建国万象更新”。

老当益壮，宁移白首之心？____，不坠青云之志。（王勃《滕王阁序》）