How long is it ________ we last had a picnic together?
Don’t talk about such things ______you are not sure of, ______ is what you should keep in mind.
—I still remember my wonderful stay there ________ I worked in the distant mountain village. —But everything is changing so fast, the persons there aren’t the ones ______they used to be.
He went out to play football, leaving his homework _________.
All her time __________ experiments, so she has no time for films.
You must have missed the first train yesterday, ________ you?