is even more important is the earth cooled down, water began to appear on its surface.
| A．When; that; when | B．What; whether; as | C．What; that; as | D．lt; whether; as |
After a day’s hard work, Mary went to the nearby shop to _____ herself to a strawberry ice cream.
| A．satisfy | B．treat | C．provide | D．offer |
Prices ______ all the time. It's no wonder that we've spent so much money recently.
| A．rose | B．had risen | C．were rising | D．have been rising |
There’s no way of knowing why one man makes an important discovery ___ another man, also intelligent, fails.
| A．since | B．if | C．as | D．while |
The doctor will see you again next week. _____, you must rest as much as possible.
| A．Somehow | B．However | C．Meanwhile | D．Indeed |
Of all the books on the shelf,is of any use for improving our practical skills of survival in the competitive world.
| A．nothing | B．no one | C．neither | D．none |