_____________he referred to in his article was unknown to the readers.
Whenever I met her, ______ was fairly often, she greeted me with a sweet smile.
It's helpful to put children in a situation ______ they can see themselves differently.
Mark drives his car too fast and, what's more, very carelessly, ________ worries his mother.
Occasions are quite rare ________ I have the time to spend a day with my kids.
The three backpackers finally reached the top of Mount Huangshan, ________ they could enjoy the breathtaking sights to their heart's content.