Last month 3 people got injured in a gas explosion, has not been discovered yet.
| A．whose cause | B．the cause of that | C．which cause | D．the cause |
Yesterday we went to visit the farm ________ my father used to work for nearly ten ye
ars.
| A．in which | B． that |
C．where | D．which |
Every time ________ they met, they would talk several hours together about the persons and things ________ they remembered in the middle school.
| A．that; who and which | B．when; which |
| C．which; / | D．/; that |
Unless you change your ________ towards your studies, you won’t make any progress, I believe.
| A．point | B．idea | C．sight | D．attitude |
He has given me so much help that I really wanted to do something for him ________.
| A．in return | B．by turns | C．in turn | D．in case |
Mr. Li is absent today. What do you consider ________ to him?
| A．happens | B．is happened | C．happening | D．has happened |