10. You can have these cookies, Grandpa. Because they are very c_______.

9. K_______ on the door before you enter another’s room, or it is impolite.

8. Six people i________ me were invited to the party last night.

7. Can you name the four famous inventions in a________ China.

6. They wanted to have an i________ pool.

5. A hundred years is a c_______.

4. A few pears r__________ on the trees.

3. This kind of camera is p_______ in an American factory.

2. I need a pair of s________ to wear at home.

1. This kind of machine can be o_______ easily, so you don’t need many skills to do the job.