—Why does the lake smell terrible?
—Because large quantities of water_______________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
The boss refused to sell the car for ________ he thought was not satisfactory.
| A．that | B．which | C．how | D．what |
________ wants to stay in a hotel has to pay their own way.
| A．Anyone | B．The one |
| C．Whoever | D．Who |
—Can we get everything ready by the weekend?
—It all depends on ________ we can get Mr.Green’s cooperation.
| A．that | B．what | C．whether | D．if |
He noticed that the straight part of the dance was different in the afternoon from ________ it had been in the morning.
| A．that | B．where | C．what | D．which |
The shopkeeper did not want to sell for ________ he thought was not enough.
| A．where | B．how |
| C．what | D．which |