______ herself in looking after the newly-born twins, she had to sacrifice her career to stay with her kids.
When the party was over, he ______ his friends good-bye and ______.
It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
Country life provides him with peace and quietness, ______ what he can’t enjoy living in cities.
What the teacher said in class set all the _____ a lot.
By the time I _____the railway station, the train _____.