В приведённом ниже тексте на место пропуска (4) нужно добавить предлог: James lives 1) ... a small flat 2) ... Cambridge. He lives 3) ... two other boys who are students 4) ... Cambridge University. They work hard during the week. James has two jobs. 5) ... Mondays, Tuesdays and Wednesdays he works 6) ... a hospital, where he helps to look 7) ... children who are ill. He goes to the hospital 8) ... bus. He starts 9) ... ten o’clock and works until quarter 10) ... five. On Thursdays and Fridays he works 11) ... home. 12) ... the evening, one of the boys cooks a meal. 13) ... dinner they look in the newspaper to see what’s on TV or they talk 14) ... their day. They usually go to bed 15) ... about midnight. Варианты: at, in, on.

He lives with two other boys who are students at Cambridge University.

Предлог at употребляется с названием учебного заведения, когда речь идёт об обучении в нём.

Ответ: at — в Кембриджском университете.