I ______ swim very well when I was younger. (could / couldn’t), could, She ______ finish her homework because she was tired. (could / couldn’t), couldn't, They ______ hear the teacher clearly from the back of the class. (could / couldn’t), could, He ______ open the door because it was locked. (could / couldn’t), couldn't, We ______ see the stars last night because of the clouds. (could / couldn’t), couldn't, My brother ______ ride a bike when he was five years old. (could / couldn’t), could, I ______ understand the question during the exam. (could / couldn’t), couldn't, She ______ find her keys anywhere this morning. (could / couldn’t), couldn't, They ______ arrive on time because of the traffic. (could / couldn’t), couldn't, He ______ lift the box because it was not too heavy. (could / couldn’t), could.

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