Ten years ago I was 5,but now I'm 15.
Ten years ago he was in shanghai,but now he is in Beijing.
Ten years ago she was single,but now she is married.
Ten years ago she liked cats,but now she prefers dogs.
Ten years ago they were my students,but now they are all gone.
Ten years ago my grandparents were still alive,but now they have been passed away for years.
Ten years ago China was not rich,but now it's rich.
Ten years ago USA was advanced,while now it is still so.
Ten years ago there was no railway to Tebet,but now there is.
Ten years ago there was not so much polution,but now everywhere is poluted.