Sun Yang, a young Chinese swimming talent,       several gold medals before the 2012 London Olympics.

With the development of high technology, more and more new things ______ in the past years.

---When ______ again?  ---When he ______, I’ll let you know.

All of the guests         by 9 o’clock , but the host        until 15 minutes later .

— Why? Tom, your shirt is so dirty! — Mum, I ＿＿ my storeroom downstairs。