What change should be made in sentence 13?

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Questions below are about the following story:     The Top Deck     (1) We walked outside through the sliding glass doors and waited in line for the large, double-decker red bus. (2) My family flew to London for a week in July to celebrate my sisters graduation. (3) She wore a blue cap and gown. (4) The sky was gray, and light puddles spotted the ground. (5) As the bus pulled up against the curb, dirty water splashed our feet.     (6) The driver’s seat was on the opposite side of the bus, and the driver smiled at me when I showed him my ticket. (7) I looked out the window and realised that... Show more

What change should be made in sentence 13?