The first time I ____ Todd, he ____ to some students at the English corner.
| A．had seen; was talked | B．saw; talked |
| C．had seen; talked | D．saw; was talking |
—What do you think of teaching，Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
| A．where | B．which | C．when | D．that |
It's helpful to put children in a situation ________ they can see themselves differently.
| A．that | B．when | C．which | D．where |
Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)
| A．when | B．which | C．where | D．while |
Sales director is a position ________ communication ability is just as important as sales skills.(2012·重庆)
| A．which | B．that | C．when | D．where |
That's the new machine ________ parts are too small to be seen.
| A．that | B．which | C．whose | D．what |