--- My parents have been to the United States.
--- Really? When _______there?
| A．will they go | B．did they go | C．had they gone | D．have they gone. |
（）My father is a _____.
A. worker B. work C. works
（） — Is she a _____?
— Yes, she is.
A. policeman B. farm C. nurse
（）I am ill. I should see a _____.
A. doctor B. driver C. farmer
（）He has a car. He _____ to work.
A. drive B. drives C. driver
（）My aunt is a teacher. She _____ in a school.
A. working B. work C. works