9. Which is the pair of the right words for the blanks ⓐ~ⓓ?
On the night of our field trip, I stopped by room 201. In the room, I saw Ian ⓐ[drew / drawing] a picture. I heard Jack ⓑ[to play / playing] the guitar. Also, I saw Kevin ⓒ[playing / to play] card games. They were ⓓ[had / having] a good time!