选词填空

hold back阻碍，阻止　　hold down控制，镇压

hold on别挂(电话)，支持下去　　hold out维持，坚持

(1)Hearing the news, she couldn’t ________ her tears coming down her cheeks．

(2)“________, please．I heard a pleasant voice on the phone．

(3)These measures helped to ________ the city’s population．

(4)The water won’t ________ much longer．