Черно-белый фон, для создания атмосферы.
Но, думаю, можно немного разбавить цветными картинками.
То есть, скомбинировать 8)
I was watching TV <span>advertisement
The children were watching the </span><span>cartoon strip
</span><span>I was watching the documentary film when they called
She was checking her e-mail when the telephone rang
I was reading my </span>horoscope when somebody knocked at the door
<span> He was hearing the local news
I was reading my favourite </span><span>magazine when he came</span>
I saw soldier in the field. He tried to hide in the tree. People celebrate holiday in the street. In the picture I have seen people. Airplane is flying in the sky.
<span>George gives me </span><span>the least</span><span> </span><span>trouble</span><span>.</span>
<span><span>Along with other verification mechanisms, the START I treaty will remain in force until </span><em>at least</em><span> December 2009.</span></span>
<span><span>All this was coming from in front of me, and to the left.</span></span>
<span><span><span>Susan and Jack were sitting </span><span>in front of </span><span>me at the theatre.</span></span></span>