HE DIDN'T GO TO BED UNTIL HE COULD SOLVE THE MATHS PROBLEMS. ( USIN...

4. - File thứ 1: DE VA DAP AN ANH 10 BAI 2, KY 2
File thứ 1: DE VA DAP AN ANH 10 BAI 2, KY 2
4. He didn't go to bed until he could solve the maths problems. ( using “ It was not until .. that ..)_ _______________________________________________________________________