. _________ the wind and the sun, the color on the board gradually ran.
| A．Being exposed to | B．Having exposed | C．Exposing | D．Exposed to |
The theory was attacked when it was first , but gradually it was accepted.
| A．put up | B．put down | C．put forward | D．put away |
Recent research has the cause of the disease.
| A．thrown off | B．thrown open | C．thrown out | D．thrown light on |
More and more students are this modern type of instruction.
| A．resulting from | B．figuring out | C．benefiting from | D．bringing up |
He has a large family to .
| A．provide for | B．supply for | C．make for | D．fit for |
His not coming our difficulties.
| A．added to | B．added up | C．added in | D．added up to |