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a) tr hay ch ?

Góc sân nho nhỏ mới xây

Chiều chiều em đứng nơi này em trông

Thấy trời xanh biếc mênh mông

Cánh cò chớp trắng trên sông Kinh Thầy.

b) ưt hay ưc ?

Chỉ còn dòng suối lượn quanh

Thức nâng nhịp cối thậm

Điền vào chỗ trống :