Is (rain) ... hard. We can not do anything until it (stop) ..... 2, Last night we (watch) ... TV when the power (fail) .......

1, Is ( rain) ..................hard.We can not do anything antil it ( stop) .................
2, last night we ( watch)....................TV when the power ( fail)................
3, I (sit) .................down for a rest while the shoes ( repair)
4, London ( change)................. a lot since we first ( come) ................. to live here