—______won the 100th gold at the Olympics for China?   —Zhang Yining. She’s from Beijing.

I will never forget that terrible accident _______ it happened so long  ago.

I didn’t know he came back __________ I met him in the street . 

 You can’t catch up with others         you work hard.

 ---Hi! Long time no see.---Yes. It’s almost three years_____ we met last time.