初中英语3:用in,for,before,ago,after,later填空

初中英语3:用in,for,before,ago,after,later填空
1,can you finish that work________half an hour?
2,they have lived here________nearly 20 years
3,about 200 million years_________,all the land in the world was joined together in one
huge continent
4,no one knows what is going to happen_______50 million year's time
5,that letter had travelled_______more than half a year before it reached me
6,he told us that 10 years________,he became a worker in a factory
7,________about 60 million years,the northern part was no longer joined to the
southern part
8,an old man lost his horse.he was worried about it day and night.but a few months
___________,the lost horse came back with another horse