It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
| A．when | B．that | C．which | D．what |
If ______ in wet sand, the vegetables can ______ fresh for a long time.
| A．being buried; remain | B．buried; remain |
| C．buried; be remained | D．burying; remain |
There is no such place ______ you dream of in this world.
| A．that | B．what | C．which | D．as |
----When can we go to visit you?
---- Anytime you feel like ______.
| A．one | B．it | C．that | D．so |
The trouble with such resources as coal, oil and gas ______ that they are not renewable.
| A．was | B．are | C．have been | D．is |
Besides being able to walk on for three days without drinking, camels can also live for a long time ______ small quantities of food.
| A．with | B．on | C．by | D．without |