Having a trip abroad is certainly good for the old couple，but it remains __________ whether they will enjoy it.
| A．to see |
| B．to be seen |
| C．seeing |
| D．seen |
The continuous rain __________ the harvesting of the wheat crop by two months.
| A．set back |
| B．set off |
| C．set aside |
| D．set out |
The play __________ next month aims mainly to reflect the local culture.
【选项 】
| A．produced |
| B．being produced |
| C．to be produced |
| D．having been produced |
Nowadays people sometimes separate their waste to make it easier for it __________ .
| A．reusing |
| B．reused |
| C．reuses |
| D．to be reused |
Many buildings in the city need re-pairing, but the one __________ first is the library.
| A．repaired |
| B．being repaired |
| C．repairing |
| D．to be repaired |