根据句意及提示写单词。
1. My parents are celebrating 30 years of their m_____.
2. Beijing is the c_____ center of China.
3. The elephant waved to us with their t_____ and ears.
4. Wish you _____ (成功).
5. Let's _____ (讨论) how to work out the Maths problem.
6. —How many _____ (表演者) are there ion the show?
— I'm not sure.
