I called the airline to ______ my flight reservation a week before I left for Canada.

 —I have telephoned him twice but I couldn’t get through.—I think that the line _____ be being worked on today.

When I opened the door, I found my father sitting in his chair, completely ______ in the humorous stories he was reading.

People complain that decisions to approve or deny a permit are often________rather than based on fixed criteria.                                               

Ten minutes later，a bus________and everybody got on it.