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----- Nội dung dịch tự động từ ảnh -----
51.If you
(study) harder in the past, you
(have) better job now.
52.1f my mother
_(not/have) operation two years ago, she,
(be) death
now.
53.Unless you
(buy) such an old car, you,
_(not/have) to fix it all the
time.
54.If she.
_(leave) last night, she
(be) in London now.
55.If I
(be) you, I
(order) more food for the last party.