Experts have been warning___of the health risks caused by passive smoking.
| A．at a time | B．at one time |
| C．for some time | D．for the time |
The Green Corporation donated the property to the state of California, with one condition ____ the Green family would be allowed to use it when they wished.
| A．what | B．which | C．when | D．that |
If Rose ____ her diamond in a safer place, it ____ stolen.
| A．had put; might not have been | B．had put; could be |
| C．had put; might be | D．had not put; could not have been |
The plan ________encourage the employees to improve their work turned out to be a success.
| A．having designed to | B．designed to |
| C．to design to | D．designing to |
—How often do you go out for supper?
—________，once a week.
A．Have no idea B．It depends C．As usual D
．Generally speaking
He’d _____
____a volleyball court on the beach with stick.
| A．turned out | B．marked out | C．made out | D．broken out |