—Are these seats available?—Sorry, sir. The seats ________.
Children who are over-protected by their parents may become _____.
Paper making began in China and from there it _____ to North Africa and Europe.
When the entire class worked together they finished the project _____.
Having checked the doors were closed, and _____all the lights were off, the boy opened the door to his bedroom.
To save class time, our teacher has ______students do half of the exercises in class and complete the other half for homework.