68. Mind you. Don’t bump your head on the low________when you go upstairs for sleep.
____ abroad for two years, the two astronauts went back home last year.
He left ________any of his friends _________ him _________.
The shop she usually did her shopping _____ every Saturday has been pulled down for the City Center.
I have a lot to say ______ that problem.
. _____ of the village _____ two small lakes.