Was it through Mary _____ was working at a high school ____ you got to know Tom?

I just don't understand_____________ that prevents so many Americans from being as happy as one might expect.

Is this the factory ______ my father visited last year.

It was two days before my mother flew to New York ______I arrived home.

---It was ___________ who helped us out of danger.---What brave and helpful children! We should learn from them.