I called you, but nobody answered. Where_______ you

Nobody knows why the boy can tell what’swritten on the paper in another room without looking at it It really _______ explanation

He said, “What’s the matter?” — He asked _____. [ ]

e photographs in this book, ____ stated otherwise, date from the 1950s.

By the middle of the 21st century, the vastmajority of the world’s population _____ in cities rather than in the country.