27.The memory techniques used are no more complex than the old ____. 　　28.Robinson taught children to use“mental journeys”to improve ____. 　　29.Robinson told the pupils that all the memory techniques could be found in ____. 　　30.The schoolchildren got a lot from the magician’s ____. 　　A.books 　　B.lecture 　　C.tricks 　　D.facts 　　E.memory 　　F.list