Say in which sentences we can't use could. 1) Mrs Brown was able to dance very well when she was younger. 2) We tried to open the door and were able to do it at last. 3) They were not able to build a new garage. 4) She was able to make lunch in ten minutes and we didn't go hungry. 5) We didn't know the address, but we were able to find the hotel. 6) It was dark outside, but Ann was able to take pictures of the palace. 7) That summer was very cold, but we were able to grow tomatoes in our garden. 8) They were not able to decide where to go.