On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.
---Why not wear your miniskirt, Rose? --- Well, my legs are too thick, if you ______ know.
We students are so busy with our homework that we have no time for outdoor exercise, ______ we have the desire.
He was wild with joy when he ______ a solution to the difficult problem.
______ of the parents has confirmed it was their child’s fault to be late for class, saying the school bus came later than usual.
______ he explained it to me did I make sense of what he said.