WHEN MY GRANDMOTHER WAS YOUNG, SHE USED (SING/ TO SING/ SANG/ SINGING) VERY WELL

7. - BAI TAP TRAC NGHIEM ANH 8 PHAN 1
BAI TAP TRAC NGHIEM ANH 8 PHAN 1
7. When my grandmother was young, she used (sing/ to sing/ sang/ singing) very well.