10 years ago, _________ only one classroom building in our school. And in 10 years, _________ five classroom buildings in our school.
It is five years since my dear aunt __________ here.
I __________ the Palace Museum with my grandparents the other day.
— We can use QQ to talk with each other on the Internet. — Really? Will you please show me __________ it.
Many families have their own cars. __________, it causes the terrible air problem.
— Hello! Remember me? — I seem to have met you __________.