肯定句：主语+be +过去分词（ + by ~）
否定句：主语+be not +过去分词（ + by ~）
一般疑问句： Be+主语+过去分词（ + by ~）
特殊疑问句： 特殊疑问词+ be+主语+过去分词（ + by ~）
Complete the sentences using the correct forms of the words in brackets.
1. Cheese _______________ (make) from milk.
2. Parents and students ___________________ (invite) to the school concert last night.
3. The underground parking lot ______________ (close) at midnight every day.
4. There is a lot of research on how languages _________________ (learn).
5. Some classic films _______________ (show) at that cinema last week.