By the time the police arrived on the scene, the burglars_______．

Tell Mary there is someone __________ for her at the door.

It is one of the funniest things ____on the Internet so far this year.

-- What made your skin look so terrible? --_______ to the sunlight for a long time. 

What surprised me most was to see some of the village people ______ on the benches at the end of the classroom .