NHANH CẦN GẤP THANK YOU B1: đưa ra dạng đúng cảu động từ trong ngoặc 1. we often (go) to school by bicycle 2. they (be) to new york many times 3. the USA (have) colour TV in 1953 4. i (not be) very happy yesterday 5. if we plant more trees the air (not be)so polluted 6. robots might (clean) our houses

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