Вставьте в предложения предлог.
1. Brian is very serious ¬¬¬¬¬______ going to university; he wants succeed _____ the career he has chosen.
1. My business partner was very pleased ______ me when I arrived ___ the office earlier to help him.
1. Ever since Linda arrived in London she has been living ___ her cousin’s.
1. They finally decided ____ a watch as a birthday present for Sue.
1. Tracy is thinking _____ leaving her present job in order to get a Master’s degree in business administration.
1. John prefers reading ___ going out; hewoesn’t really like socializing ____ a lot of people.
1. I’m worried ___ Tom, he hasn’t called for weeks – I warned him ____ traveling on his own, but he would not listen.
1. Joanne is so serious ____ her schoolwork that she is very popular ____ all her teachers.