When did the earthquake of Ya’an happen–It happened _______ April 20, 2013.

The brave soldier, ________, jumpedinto the cold river to save the girl who wanted to kill herself.

Things lost sometimes just turnup________you never expect to find them

Ladies and gentlemen，I have the great privilege________introducing our speaker for tonight.[ ]

Can I join the club, Dad? —–You can when you ___ a bit older.