Please excuse me _______ your letter by mistake.
—How are you getting on with your book?—I have finished a large part of it; the rest of it ________ more difficult.
I’ve got a lot of books, ________ are written in foreign languages.
—May I speak to your manager Mr. Williams at five o’clock tonight?—I’m sorry. He ________ gone to a party long before then.
—When did the story happen?—It happened in ________ spring of ________ 1937.
The item you requested yesterday is no longer available and ________ we are returning your cheque.