We can see many examples in our life _____ positive thinking changes a person completely.
As a teacher, I seldom give my students so difficult a problem ________ they can not work out.
— Do you like a house with no garden? —________. But anyhow, it's better to have one than none.
Being determined is a kind of quality and that’s ________ it takes to do anything properly.
Before making your speech, you’d better ________ your thoughts and ideas.
—Did you remember to give Jenny the money? —Yes. ________ I saw her, I'm sure.