I got 13 out of 15. 87% I thought "keep the Sabbath Holy" was a commandment. and I was a Manchester Cathedral choirboy many years ago (1948). Blimey 66 years ago, how time flies..
Alec, keep the Sabbath Holy is a commandment. Do as you would be done by isn't, although Jesus uses the sentiment as a summation of the second part of the commandments when he summarizes the 10 as 'Love the Lord your God with all your heart and body and spirit and love your neighbour as yourself' this, of course led to the question 'but who is my neighbour?' to which the answer comes as the parable of the good Samaritan.