Cho dạng đúng của động từ trong ngoặc: 1.there used to (be) ......a big tree in front of her house. 2.he (watch).......an important football match at 7.00 tomorrow evening 3.he (learn).....how to play the piano since he was 5 4.this exercise (do).......by her this evening. 5.she (walk)........ to school,doesn't she? Giúp mình vs

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