— Who is _______, Bill, Tom or John?
— I think John is ____ than Bill and Tom.
| A．the most serious; more serious |
| B．the most serious; serious |
| C．serious; more serious |
| D．more serious; more serious |
—Listen! Peter is singing in the classroom!
—It _____ be him. He has gone back to his hometown.
| A．must | B．mustn’t | C．may not | D．can’t |
Keys _______ opening the lock in the door.
| A．used for | B．are used | C．are used to | D．are used for |
—I have never been to the Great wall.
—If you have an opportunity _______ there, you must take it.
| A．to go | B．to going | C．going | D．go |
There was _____ woman in the room, sitting and looking at me in the dark.
| A．a 80-year-old | B．an 80-year-old | C．a 80-years-old | D．an 80-years-old |
—How do you study English so well?
—I think _________ English movies is a good way to learn English.
| A．watching | B．learning | C．reading | D．looking |