Since the new speed limits ______，the number of accidents in the area has fallen strikingly．
| A．were introduced | B．introduced |
| C．have been introduced | D．have introduced |
The manager had fallen asleep where he_______，without undressing.
| A．was laying | B．was lying |
| C．had laid | D．had lied |
Give yourself 10% of________is left for your work and let me have the rest.
| A．which | B．that | C．what | D．where |
The school has developed an online system________ students can choose their own teachers.
| A．which | B．when | C．that | D．where |
We should do what we have to do________ we can do what we want to do in the future.
| A．so that | B．in case | C．for fear that | D．now that |
—Is that the small town you often refer to?
—Right, just the one________you know I used to work for years.
| A．that | B．which | C．where | D．what |