Điền could, couldn't hoặc was/ were able to: A girl fell into the river but fortunately we....rescue her

điền could, couldn't hoặc was/were able to
1 A girl fell into the river but fortunately we..........rescue her
2 I .............walk when I was less than a year old
3 My grand father .............walk without any help last night
4................you understand what he saying?
5 my grandmother..............speak Spanish
6 Suddenly at the lights went out. We.......... see a thing
7 The cpmputer went wrong, but luckily Emma..........put it right again