.----I can’t find Jack. Where did you see him this morning?
----It was in his factory _______he worked.
| A．where | B．which |
| C．that | D．on which |
You said boys were cleverer than girls. That is _______ I disagree.
| A．what | B．where | C．which | D．why |
With the rapid growth of population, the city______ in all directions in the past five years.
| A．spreads | B．has spread | C．spread | D．had spread |
The bell______ the end o f the period rang and we had to stop our discussion.
| A．indicating | B．indicated | C．to be indicated | D．being indicated |
The question is ______can be put into practice.
| A．how you have learned | B．how what you have learned |
| C．that why you have learned | D．how that you have learned |
The announcement ______all flight were cancelled because of bad weather greatly distressed the waiting passengers.
| A．that | B．which | C．why | D．of which |