Please excuse me _______ your letter by mistake.
---How long has your brother been working here?---_______ he graduated from college in 2007.
Tom insisted what he said ______ true, but we insisted that he _____ and have a look.
I’d prefer ______ in the office rather than ______ at home watching TV.
Half an hour has been made full ______ of _____ the problem.
Neither of them knows the difference ______ the two and we can’t tell one ______ the other, either.