Compare each pair of words and complete the following sentences with the right one. Change the form if necessary. 1) own, owner His father ___________ a big factory. I am the ___________ of these three cars. 2) compete, competition There was a lot of ___________ between my brother and me when we were kids. We are too small to ___________ with a company like that. 3) exist , existence, Jones led a lonely ___________ in a village for several years. People can’t ___________ for long without water. 4) apology , apologize I ___________ for taking so long to reply. We would have been happy with an ___________. 5) threat, threatening Pollution has become a great ___________ to our daily life. She’s been receiving ___________ phone calls lately.