Đọc đoạn văn và khoanh tròn A,  , C hoặc D ứng với phương án đúng để hoàn chỉnh đoạn   văn sau 
The History of Shoes
In  the past,  importance (0) _  _ not given  to shoes  being comfortable or  fashionable.  These  early foot coverings were probably animal skins,  which people tied  round  their  ankles during  cold  (1)_ _. We still use leather today,  but  other materials such  as  silk, plastic, or  cotton  are  also  popular, depending (2)           _ what is in fashion.
It was only one hundred and fifty years ago that people began to wear a different shoe on each  foot. Formerly, the two shoes had been straight instead of shaped and (3) __        be worn on the left    or the right foot. All shoes used to be made by hand, but now, (4) ___  _ there are shoemakers still  using their traditional skills, most shoes are now machine-made in large factories. The introduction of sewing machines allowed the shoe industry to produce a large (5) __  of cheaper shoes for a wider range of buyers.

A.number
B.total
C.sum
D.size

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