He stays up____ in the evenings to go online to get the____ information

The light is still on in his room. Do you know ___________ —Maybe he has to study for a test.

Earth is believed ____ by an object the size of Mars at some point in the distant past before its surface cooled.[ ]

The question is too difficult and we found ________.

36. The entrance is _____ with such heavystones as two or three big men can’t move.