Because he works in a remote area, he visits his parents only ______.
--- _______ he come in or wait outside? --- Let him in, please.
--- Have you got ready for the meeting? --- Not yet. We need ________.
He took off his coat, _____ all his pockets, but couldn’t find his key.
He will spend six hours at his desk _______ he finishes his composition.
--- What is the matter with the pen? --- The ink _______come out.