WHEN I WOKE UP, I HEARD SOMEONE………IN THE NEXT ROOM.A. SINGING B. S...

10. - DE KIEM TRA HOC KYII LOP 10
DE KIEM TRA HOC KYII LOP 10

10. When I woke up, I heard someone

………

in the next room.

a. singing

b. sang

c. to sing

d. was singing