Complete using a, an or the. If an article is not necessary, put a dash (-). In fact, it wasn't so easy. People carry (5) how it works. We know that (6) (7) understand (9) (10) intelligent. 12 Revision Test 3: Units 13 - 18 Artificial intelligence In (1) 1960s and 1970s, (2) scientists were confident that ..... simple computers would be able to think very soon. They thought that it was (3) problem: just make computers that could think like the human brain. It seemed easy to make computers that could play (4) .............…......... chess, so why not ones that could think about other things? information about the world and apple can't speak, for example, or that Moon is a long way away. Although (8) powerful computer can simple situation, it's very difficult to program it to understand real world. It will be a long time before we have computers that are truly (1 mark per answer)​