Read each fact about a museum object. Complete the sentence with the correct modal verb: must, can’t, may (not) or might (not). Use the clue in brackets to decide how certain the conclusion is.
1. A painted wooden mask includes colours and patterns that are common in several neighbouring regions, but there is no record showing exactly where it was made. The mask come from one of those regions.
(possible)
2. Experts are examining a handwritten diary donated to the museum. Its paper carries a verified watermark from the correct period, the ink matches other documents from the same decade, and the museum has a complete record of who owned it. The diary be authentic.
(all the available evidence strongly points to this conclusion)
3. Experts are examining handwritten notes on the edge of an old map. The ink looks slightly different from the ink used in the original text, but laboratory tests have not yet confirmed when the notes were added. The notes be original.
(possibly not true)
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