Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
We don't know ___ to pay a visit to the old town.
The question __ we will hold the sports-meet next Sunday will be decided very soon.
We were very much surprised at the way ___ she treated the old woman.
___ a terrible storm would take place in Hainan.
The playground ____ we built last year is very large.