Mary’s hobby is singing. She enjoys (17) ………..…….…...

Câu hỏi: Mary’s hobby is singing. She enjoys (17) ………..…….… very much. When her brother (18) ……….……… a karaoke set last month, Mary was so glad that she sang every day after dinner. She likes to sing only (19) ………………. songs. In fact, she has already sung all the songs found (20) …………..… the karaoke discs. Mary is singing in the karaoke (21) ……………… organized by the RC Center this Saturday. Her family is going there to support her.(17) __________

A. sing

B. singing

C. to sing

D. sings