This is not an economical way to get more water; ________, it is very expensive.
| A．in return | B．on the other hand | C．in a word | D．on the contrary |
When I handed the report to John, he said that George was the person _______.
| A．to send | B．for sending it | C．to send it to | D．for sending it to |
She looks forward every spring to _______ the flower-lined garden.
| A．visit | B．paying a visit | C．walk in | D．walking in |
A cook will be immediately fired if he is found _______ in the kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
It is said that in Australia there is more land than the government knows _______.
| A．it what to do with | B．what to do it with |
| C．what to do with it | D．to do what with it |
The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |