Your grandfather is rather tired so do not ______ your visit
A. Shorten
B. Lengthen
C. Delay
D. Prolong — Shorten: làm ngắn hơn
Lengthen; kéo dài ra (i have to lengthen this skirt)
Delay: làm chậm trễ, hoãn
Prolong: kéo dài (do not prolong the discussion unnecessarily)
=> prolong
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