合并句子...1.I regret the days.I wasted the days in the woods.=I

合并句子...
1.I regret the days.I wasted the days in the woods.
=I regret the days __________ I wasted in the woods.
2.I'll never forget1976.1976 was full of sadness.
=l'll never forget 1976 __________ was full of sadness.
3.l still remember the day.On that day l joined the Party.
=l still remember the day __________ l joined the Party.
=l still remember the day __________ l joined the Party.
4.This is the factory.He visited the factory yesterday.
=This is the factory __________ he visited yesterday.
5.This is the factory.He works in the factory.
=This is the factory __________ he works.
=This is the factory __________ he works.
6.This is the reason.The reason is unreasonable.
=This is the reason __________ is unreasonable.
7.This is the reason.He was killed for the reason.
=This is the reason __________ he was killed.
=This is the reason __________ he was killed.