After graduation, Frank often thought of those who had helped him ________ his school life.
| A．of | B．across |
| C．at | D．through |
She showed the visitors around the museum, the construction __________ had taken more than three years.
| A．for which |
| B．with which |
| C．of which |
| D．to which |
Was it on a lonely island __________ he was saved one month after the boat went down?
| A．where |
| B．that |
| C．which |
| D．what |
—Silly me! I forget what my luggage looks like.
—What do you think of __________ over there?
| A．the one |
| B．this |
| C．it |
| D．that |
We have various summer camps for your holidays； you can choose __________ based on your own interests.
| A．either |
| B．each |
| C．one |
| D．it |
The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase __________.
| A．them |
| B．those |
| C．it |
| D．that |