—When _________ the car _______ ?
—Sorry. I don’t know.
| A．does; invent | B．did; invent | C．was; invent | D．was; inventing |
By the time of last year, she ______ the piano for five years.
| A．learnt | B．has learnt | C．had learnt | D．will learn |
Tom likes the book ______ she borrowed from Jim.
| A．who | B．that | C．whom | D．whose |
—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 |