用所给词的适当形式填空。

1. Mother told her little son ______ (wait) for her outside the school gate after school.

2. He told us that there ______ (be) a wonderful party tomorrow afternoon.

3. The teacher told us the earth ______ (go) round the sun.

4. I ______ (call) you yesterday, but no one answered.

5. To my ______ (surprise), Tom didn't pass the final exam.

According to the rules and regulations, all payments _____ be made in cash in the shopping center.

A．shall

B．can

C．must

D．should