---_________ ?
---I’m not sure, but he might have been ill in bed.
| A．What do you think has happened to Tom |
| B．What do you think Tom has happened |
| C．Do you think what has happened to Tom |
| D．Do you think what Tom has happened |
As we all know, ______ medical examination will help us find out health problems as early as possible.
| A．common | B．general | C．regular | D．normal |
Ann ______ here any more．She left last month.
| A．won’t work | B．doesn’t work | C．hasn’t worked | D．isn’t working |
The conference aims to develop business and let people think about ______ they can have a positive influence on the planet.
| A．why | B．that | C．what | D．how |
The traffic rule says young children under the age of four and less than 40 pounds must be in a child safety seat.
| A．being weighed | B．to weigh | C．weighed | D．weighing |
—According to my grandma, it is a good idea to eat chicken soup when you have a cold.
—, scientists agree with her.
| A．Sooner or later | B．Once in a while | C．To be exact | D．Believe it or not |