A. laughing; interesting B. laugh; interested C. to laugh; interesting D. laughing; interested
A. discussing B. with discussing C. to discuss D. discuss
A. keeps to change B. keeps changing C. kept to change D. kept changing
A. borrows; lend B. borrowed; to lend C. borrowed; lending D. lent; to lend E. lent; lending
A. to be cleaned; do B. cleaning; to do C. being cleaned; do D. cleaned; to do
A. to swinmming B. swim C. swimming D. for swimming
A. telephone; asking B. to telephone; asking C. telephoning; asking D. telephoning; to ask
A. leaving B. left C. leave D. leaves
A. seated B. seating C. to seat D. sat
A. to hear B. to hearing C. of hearing D. hear