27. _____ the teacher came in, everyone was quiet.
| A．Direct | B．Directly | C．Directly when | D．Direct when |
Her son,to whom she was so_____,went abroad ten years ago.
| A．concerned | B．cared | C．devoted | D．loved |
Before use, your new mobile must fully____.
| A．get charged | B．become charged |
| C．remain charged | D．turn charged |
—Americans spend more on health care than most other people .
— You’re right . But a new study shows that life in the United States is falling .
| A．development | B．position | C．experience | D．expectancy |
--- Will you waste your time and money on that?
--- Certainly ________.
| A．I not | B．don’t | C．not | D．no |
_________ to 100℃, water will boil.
| A．Being heated | B．Heated | C．Heating | D．To heat |