When my grandfather was young, he ____________ run very fast., could, couldn't, I ____________ sleep last night because the neighbors were too loud., could, couldn't, ____________ you please help me with this math homework?, could, couldn't, She looked everywhere, but she ____________ find her car keys., could, couldn't, The sky is very dark; it ____________ rain this afternoon., could, couldn't, Twenty years ago, people ____________ buy smartphones. They didn't exist!, could, couldn't, Rio studied hard, so she ____________ answer all the questions on the test., could, couldn't, Excuse me, ____________ I use your phone for a quick call?, could, couldn't, We ____________ go to the beach yesterday because the weather was terrible., could, couldn't, The teacher spoke too softly, so the students ____________ hear the lesson., could, couldn't

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