She bought the same skirt at a lower price at the same shop where I bought mine because she was a __________ customer.
| A．common | B．usual |
| C．normal | D．regular |
You can find whatever you need at the shopping centre,_____is always busy at the weekend.
| A．that | B．where | C．what | D．which |
These newly-produced cars are sold at so low a price_____people expected.
| A．like | B．as | C．that | D．which |
The most important thing_____we should pay attention to is the first thing _____I have said.
| A．which; that |
| B．that; which |
| C．which; which |
| D．that; 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 |