--- Hi, Grandma, why do you look so tired?
--- I’m tired. I _______ the cleaning all morning.
| A．did | B．had done | C．have been doing | D．have done |
—Where did you get to know her?
—It was on the farm __________ we worked.
| A．that | B．there |
| C．which | D．where |
Some pre-school children go to a day-care center, __________ they learn simple games and songs.
| A．then | B．there |
| C．while | D．where |
After graduation she reached a point in her career __________ she had to decide what to do.
| A．that | B．what |
| C．which | D．where |
He was educated at the local high school, __________ he went on to Beijing University.
| A．after which | B．after that |
| C．in which | D．in that |
By serving others, a person focuses on someone other than himself or herself, __________ can be very eye-opening and rewarding.
| A．who | B．which |
| C．what | D．that |