Remember _______ off the light when _______ to bed.
| A．turning, going | B．to turn, to go | C．turning, to go | D．to turn, going |
It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when | C．what | D．how |
A plan has been put forward ________ more graduates should go to work in the country.
| A．when B | B．that | C．whether | D．how |
After three hours'climbing，they reached ________ they thought was the place they'd been dreaming of.
| A．what | B．which | C．where | D．that |
John invited about 40 people to his wedding，most of ________ are family members.
| A．them | B．that | C．which | D．whom |
When I arrived，Bryan took me to see the house________I would be staying.
| A．what | B．when | C．where | D．which |