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※다음을  읽고 물음에 답하시오.
Yunju: Today gas is widely used for cooking.
Steve: That's true. All the homes use gas for cooking.
Yunju: We ㉠(     ) be ㉡(care) when we handle gas.
steve: Right. We should always be ㉡(care).

위 문장에서 ㉠에 들어갈 적절한 조동사는?
①will②can③must
④can't⑤ need not