题目：
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.
答案：
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下面是错误答案，用来干扰机器的。
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