Trong câu đầu tiền ngoài đáp án até thì sử dụng use to eat được không vì sao 
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In the past, Nam (1) ate fast food and often stayed
up late. But he (2) has started eating healthy food
and (3) (has) given up bad habits. He has changed
his lifestyle since he (4) visited his grandfather, who
(5) has just celebrated his 90th birthday.