Don’t speak all at once, please .
When I got on the bus,I ________ I had left my wallet at home.(2011·山东)
The three of us ________ around Europe for about a month last summer.(2012·天津)
My parents ________ in Hong Kong.They were born there and have never lived anywhere else.
A lot of people often forget that oral exams ________ to test our communicative ability.
The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.(2011·江苏)