---Where’s Mabel?
---She _____ ping pong behind the teaching building.
| A．is playing | B．was playing | C．played | D．had played |
The engineers made two big plans for the dam, ____ was never put in force.
| A．one of them | B．which |
| C．one of which | D．every one of which |
—Your book, Tommy?
—No, Mom, it’s my friend’s.
—Remember to return it to ____ name is on it.
| A．what | B．which | C．whose | D．whosever |
I’d like to live somewhere ____ the sun shines all year long.
| A．which | B．that | C．where | D．in which |
You could see the runners very well from _________ we stood.
| A．which | B．where | C．that | D．when |
The size of the audience, ____ we had expected, was well over one thousand.
| A．whom | B．who | C．as | D．which |