Точка О — середина диагонали BD ромба ABCD. Какие векторы с началом и концом в точках А, В, С, D и О перпендикулярны вектору ВО

I.   I wrote my name at the top of the page.
2-  The moon goes round the earth every 27 days.
3.  The Soviet Union was the first country to send a man into space.
4.   Did you see the film on television or at the cinema?
5.   After lunch, we went for a walk by the sea.
6.  I'm not very hungry. I had big breakfast.
7.  John was the only person I talked to at the party.
8.   Tim lives in a small village in the country.
9.   Peru is a country in South America. The capital is Lima.
10. I never listen to the radio. In fact I haven't got a radio.
11.  It was a beautiful day. The sun shone brightly in the sky.
12.  I've invited Tom to dinner next Wednesday.
13. What is the highest mountain in the world?
14.  We don't go to the theatre very much these days. In fact, in the town we live there isn't a theatre.
15.  It was a long voyage. We were at sea for four weeks.
16. I prefer swimming in the sea to swimming in pools.
17. Can you turn the television down, please? It's a bit loud.