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※ 다음 글을 읽고 물음에 답하시오.

Su-jin ( ㉠ ) shopping with Cathy yesterday. They ( ㉠′) to a big supermarket downtown. It was noisy there. Hundreds of people were shopping at the same time. There were many interesting things in the supermarket. Su-jin got some bread and milk. Cathy got shampoo and toothpaste. Cathy used a coupon for the shampoo. So she could ( ㉡ ) 500 won.

1. ㉠과 ㉠′에 go의 알맞은 형을 넣으시오.