1. Her teeth _____ really beautiful when she was younger.

• were

• was

• are

2. My grandma's mattresses _____ new twenty years ago.

• are

• was

• were

3. These __________ were not cheap a year ago.

• mattress

• mattresses

• mattresss

4. His ______ were complete in the dental plaster model. Not anymore.

• tooths

• tooth

• teeth

5. My feet _____ very cold early this morning.

• were

• was

• is

6. The men _____ very sad when their old friend died.

• are

• was

• were

7. Some _____ were in the laboratory, but they managed to escape.

• mouse

• mice

• mouses

8. Many __________ were involved in World War II.

• country

• countrys

• countries

9. Two _______ were in quarantine a month ago.

• octopi

• octopus

10. Five ________ were not enough, so she bought two more.

• shelves

• shelf

• shelfs