Complete each pair of words and complete the following sentences with the right one. Change the form if necessary. (1)own owner I'm the 1_______ of these three cars. His father 2_______ a big factory. (2)compete competition There was a lot of 3_______ between my brother and me when we were kids. We are too small to 4_______ with a company like that. (3)exist existence Jones led a lonely 5_______ in a village for several years. People can't 6 _______for long without water. (4)apologize apology I 7_______ for taking so long to reply. We would have been happy with an 8_______. (5)threat threatening She's been receiving 9_______ phone calls lately. Pollution has become a great 10_______ to our daily life.