Turn the radio ______, please! The baby has just fallen asleep.
| A．up | B．off | C．on | D．over |
To invent a new kind of electric light, Thomas Edison did lots of ____.
| A．research | B．inventions | C．experiments | D．experiences |
The Kings have been in Beijing for three years, so they are familiar ____ the city.
| A．to | B．with | C．for | D．on |
My father is getting older and cannot jump as ____ as he could before.
| A．high | B．higher | C．highest | D．the highest |
There are many shops on ____ side of the street. We can buy everything we want.
| A．both | B．all | C．either | D．every |
The workers finished mending the road ____ this month.
| A．in | B．by | C．at | D．on |