Tom was thinking about how to explain to the teacher why he was late for class, when a good idea ______ to him.
I’m sure I _____ her four years ago.
An unexpected heavy rain caused severe flooding, and the water _____ all the time.
_____ a noise just then?
Great changes _____ in the last twenty years in China.
— Where _____? — I got stuck in the heavy traffic. I _____ here earlier.