It has been a long time for human to make _____ to reach the moon.
The ______ is that the new machine will arrive tomorrow.
The employee must have been dismissed by the employer last month, _______ he?
--- We really enjoyed ourselves at the party. Thanks again, Mr and Mrs Johnson. ---______. Just drop in whenever you feel like it.
It's no secret to us, but he alone is in the dark. It means ___.
The door opened and in ______.