When we worked in the same office, we _____ often have coffee together.
---I heard Tom was badly injured in the football match. ----________, let’s go and see him.
Scientists have found it seems _______animals and humans are much alike than we thought.
Parents should see to it _______ their children form the habit of brushing their teeth every day.
The computer system _______suddenly while he was searching for information on the Internet.
What fun it is to walk alone with full moon hanging in the sky.