They live_____ the _____ floor.
| A．on, nine | B．in, ninth | C．on, ninth | D．on, nineth |
The maths problem was so difficult that none of us could ____.
| A．try it out | B．work it out | C．look it up | D．work on it |
— Can you show me the _____ of your school on the map?
— Sure. It’s here, next to the park.
| A．position | B．shape | C．direction | D．height |
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 |