Bộ 20 đề thi Tiếng Anh vào 10 có đáp án cực hay (Đề 20)

The average of pocket money received by teenagers fell to £4 a week this year.

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The average_______ of pocket money received by teenagers fell to £4 a week this year.

number

sum

digit

amount

Giải thích

Đáp án D