The Benton Horde, a priceless collection of ancient Roman silver, 14. (disappeared) from its display cabinet in the British Museum. At today‘s emergency press conference, the Museum director John Clive said, that according to his theory, the treasures 15. (had probably been stolen) by a professional gang on behalf of a specific collector. The matter is that the stolen silver 16. (is) very well-known and it 17. (has never been sold) on the open market.
Ten museums 18. (have been robbed) in the last six months and the number 19. (has been rising) steadily over the last few years. The Benton Horde 20. (is considered) one of Britain‘s most important collections of Roman silver. It 21. (had been lying) undiscovered for almost sixteen centuries beneath a Sussex field until it 22. (was found) incidentally in 1926.
1. I saw him because he had not left for work.
2. He didn't get the job because he had not sent all his papers in.
3. The dog was really hungry. Mary had not fed it since Monday.
4. Derrick was very tired. He had not slept at all.
5. The house didn't fall down. Luckily, the termites had not eaten all the