7. Martin Luther King led a struggle for political rights, ___________ (平等) and freedom.

6. His work on the cause of the disease is of ___________ (首要的) importance to the whole world.

5. In ancient times, the Great Wall was built as defense works, ___________ (保卫) the country against any possible enemy.

4. You can refer to this Grammar for Middle-school Students, in which grammar rules are well s　　　　　 .

3. She wrote the book in c　　　　　　 with her sister.

2. It is your _______________ (责任) to make sure that all the visitors have a chair.

1. We must rid out kitchen of those boring cockroaches (蟑螂) which are always c　　　　 our food.