Sarah forgot her glasses, so she ... read the small letters on the board, could, couldn't, When my grandfather was young, he ... climb mountains easily, could, couldn't, We ... find the dog yesterday, because it was in front of me, could, couldn't, The car ... pass through because the road was flooded., could, couldn't, When he was younger, he .... ride a bicycle, but now he can’t., could, couldn't, She ... fully understand about the quantifiers., could, couldn't, The laptop was broken, so the students .... work in the IT lesson., could, couldn't, When they were five years old, they ... read simple English words, could, couldn't, (−) The child .... dress himself when he was a baby., could, couldn't, .... he run fast and win a competition last year?, Could, couldn't.

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