1. Do you know who the computer was i _______by?

2. The seat belt on a plane are a _______.

3. It was a big m________ to leave my umbrella at home.

4. A c______ is a hundred years.

5. Boys, stop t_____ stones to the poor dog.

6. Have you m_____ the baby‘s milk yet?

7. He was wearing a new cap, but I didn‘t even n_____ it.

8. Salt is p_____ in East and South China.

9. A machine is made of m_____.

10. We took the pictures with the new c_____ last month.