Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom

The sunlight came in _____the windows in the roof and lit up the whole room[ ]

You are under 18 years old, so it’s_______for you to join Trail walker.

You said his lecture was instructive, but I don’t think it ___ any sense.

Look at the sign. You have to _____ in the library.