Are all of the underlined parts in these sentences correct? Please correct them if necessary. 1 Have you heard about

1. Have you heard about Sophie? She quit her job.
(The word "has" is unnecessary because the action of quitting her job is completed in the past.)

2. My mother grew up in Italy.
(This sentence is correct as it is.)

3. How many plays did William Shakespeare write?
(This sentence is correct as it is. The word "did" is used to form a question in the past tense.)

4. I can"t remember his name. Was it Joe or Jack?
(This sentence is correct as it is, but it would be better to use quotation marks instead of double quotes around "Joe or Jack.")

5. Who invented paper?
(This sentence is correct as it is. There is no underlined part to correct.)

6. Drugs have become a major problem worldwide.
(This sentence is correct as it is. There is no underlined part to correct.)

7. We washed the car, but now it"s dirty again.
(This sentence is correct as it is. There is no underlined part to correct.)

8. Where were you born?
(This sentence is correct as it is. There is no underlined part to correct.)

9. Ellie went shopping. She will be back in approximately an hour.
(This sentence is correct as it is. There is no underlined part to correct.)

10. Albert Einstein is the scientist who developed the theory of relativity.
(This sentence is correct as it is. There is no underlined part to correct.)