— _____ the front door is broken, we need to send for someone to repair it.
— Let’s ask Jack for help. He does good repair work.
| A．Although | B．Unless | C．Though | D．Now that |
The World Wide Fund for Nature is an organization_____aim is to protect wildlife.
| A．who | B．where | C．which | D．whose |
A container weighs more after air is put in,_____proves that air has weight.
| A．as | B．it | C．that | D．which |
I’ll take you to a shopping center nearby_____you may buy all_____you need.
| A．that; that |
| B．which; that |
| C．where; which |
| D．in which; 不填 |
Do you know the reason_____she didn’t attend her boyfriend’s birthday party yesterday?
| A．why | B．which | C．for that | D．for why |
What especially impressed us was the way_____the girl studied foreign languages.
| A．不填 | B．which | C．by which | D．how |