| Our teacher told us that pollution _____ a very serious problem in the world we live. |
A. has be B. had been C. is D. was |
| — ______? — Everyone is well and everything is all right. |
A. What is it B. How is it going C. What are you doing |
| — ______ do you go to visit the museum? — ______. |
A. How often; Twice a month B. How long; Three times a week C. How, Once two months |
| — What is your father like, Tommy? — ______. |
A. He is forty B. He is warm and friendly C. He is a worker |