В чем разница между him, his; its, it; their,them?Как правильно:1.Lavrov comes to (his,him) office at 9 o'clock in the morning.2.Our businessmens learn English. They want to speak (its, it) well.3.Our office manager often meets...

В чем разница между him, his; its, it; their,them? Как правильно: 1.Lavrov comes to (his,him) office at 9 o'clock in the morning. 2.Our businessmens learn English. They want to speak (its, it) well. 3.Our office manager often meets foreign bisinessmen and discusses prices for different goods with (their, them)?