-- Is it necessary that he ____ to London but to New York?-- I think so, but the problem is ____ he has refused to.
____ in her best suit, the girl tried to make herself ____ at the party.
The secretary is very careful and never ___ any little points in her daily work.
Jack offered us a big meal when he was leaving the office, but our work ____, we refused it.
In the library new books have to be ___ before they are put on shelves for reader’s use.
Your suggestion sounds very good, but there are many ___ difficulties we have to face.