29. New ways _____ to prevent the river _____.
| A．have found out, from polluting |
| B．have found, from being polluted |
| C．have been found out, from being polluted |
| D．have been found, from being polluted |
Ruth has been married ___ Steven for ten years but she does not know her husband is a door-keeper.
| A．with | B．to | C．for | D．on |
This is the room ___ Uncle Tom once lived,
| A．which | B．that | C．where | D．on which |
The apples on the table belong to us, but the ___ on the floor belong to Mary.
| A．thing | B．one | C．ones | D．one’s |
__away the difficulties, the Swede fought bravely in many battles and gained their respect.
| A．Smoothed | B．Smoothing | C．Having smoothed | D．Having been smoothed |
Who ___ told you that?
| A．on earth | B．on the earth | C．in earth | D．in the earth |