You can smoke here ______ you leave a window open to let the smoke out.
. Written English is more or less the same in both British and American English _______ the differences in spelling.
. ---Do you like cooking, Mary? ---________. Luckily I’ve never had to worry much about it.
. In our school, there is a rule that anyone shouldn’t play computer games during the ______ working time.
. If you compare food costs today ______ of a year ago, you will find the difference.
. As I grew up in a small town at the foot of a mountain, the visit to the village_____ scenes of my childhood.