用过去完成进行时合并下列句子
【小题1】The heavy snow fell for three days. The fields were all white.
____________________________________________________________________
【小题2】I learnt English for three years. And then I went to London.
____________________________________________________________________
【小题3】Our factory made bikes for 10 years. Then the electric bikes appeared.
____________________________________________________________________
【小题4】They lived in that city for ten years. They had to leave there last month.
____________________________________________________________________
【小题5】I waited for you for half an hour. You didn't appear at all.
____________________________________________________________________