I. Complete these sentences with “could, couldn’t” or “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 grandfather _______walk without any help last night. 4 .  _______ you understand what he was saying? 5.   My grandmother ________ speak Spanish. 6 .  Suddenly all the lights went out. We ________see a thing. 7.   The computer went wrong, but luckily Emma ________ put it right again. 8.   There was a big party last night. You ______ hear the music half a mile away. 9.   I learnt to read sheet music as a child. I ______ read it when I was five. 10.     People heard warnings about the food, and they _______move out in time. 11.      She wasn’t at home when I phoned but I     _______ contact her at her office. 12.     Mrs Carter _______ put out the fire before the house burnt down. 13.      I looked everywhere for the books, but ______ find it. 14 .     The plane ________ take off at eleven o’clock, after the fog had lifted. 15 .     Jack was an excellent tennis player. He ________beat anybody. 16 .     The car fell into the river. The worker ______ get it out but the driver was dead. 17 .     I knew the town so I ______advise him where to go. 18 .     Despite the arrival of the storm, they _______finish the football match. 19 .     After his car crashes, he was so confused that he ._____tell the police who he was or where he was going. 20 .     I haven’t ________ concentrate recently on work. I don’t know what it is. Giúp tui đi tui chọn.