根据句意，用括号内所给动词的适当形式填空。

1. You shouldn't have _____ (leave) so soon at the party.

2. He is _____ (suppose) to arrive at the station at 8:40.

3. They lay on the beach, _____ (look) up into the blue sky.

4. Eating dumplings at the Spring Festival _____ (be) the custom in our country.

5. I was very embarrassed at the party because I _____ (wear) the wrong clothes.

中国封建社会政治的基本特征是（）

A．高度中央集权的封建君主专制

B．族权和 * * 相结合

C．国家统一和各民族经济文化紧密联系

D．结构稳定、延续，发展缓慢、迟滞