Your story is perfect; I've never heard _______ before.
I have bought two ball pens ,______ writes well.
—— Oh, it’s raining hard outside. Mum, do you think the milkman will come? —— Of course. He will come on time _____it rains.
Jane likes collecting stamps very much. In fact, her interest in it ___ back to her school days.
______ when to leave, I could only stay at home, _____ nothing.
The professor kept telling us that the future _____ to the well-educated and I kept wondering where I _____ of it.