My granddad _____ run really fast when he was younger. ...

★ Modals and Past Modals

My granddad _____ run really fast when he was younger. He won a lot of races.

A. can

B. can’t

C. could

D. couldn’t

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You should have studied for the exam.

A. You’re going to have an exam soon

B. You sat for the exam and got bad results

C. You sat for the exam and got good results

D. You’re not going to have an exam