trungkientran82001 2/24/2024 10:24:33 AM

7. He kept ________ to the manager about this.

A. complaining

B. complain

C. to complain

D. complained

8. When we entered the room, we saw a rat ________ towards a hole in the skirting board.

A. scampers

B. to scamper

C. scampering

D. scampered

9. She sat down and I heard her ________ a lovely song until she finished it.

A. singing

B. sing

C. to sing

D. sang