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We all understand that learning a foreign language ______ time and efforts.
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No matter how________, it is not necessarily lifeless.
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I’ll go there if it________tomorrow.
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The teacher has told us something _____ we should do in the summer holiday.
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一个平行四边形的底是4.8分米,高是1.6分米,与它等底等高的三角形面积是________平方分米.
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