<span> Потому что в вопросе, который начинается со слова WHEN <em>всегда</em> глагол ставится в Past Simple.
В первом предложении <u>действительный залог</u>, значит вспомогательный глагол DID.
Во втором предложении <u>страдательный залог</u>, значит вспомогательный глагол WERE (WAS)
Если в предложении есть сигнальные слова just, already, not yet, this week, this year, today, то глагол ставим в форму Present Perfect - have (has) + глагол в III форме.
НАПРИМЕР: When did he come? - Past Simple
He has just come. - Present Perfect</span>
I think we can vote for the Moscow Underground. The Moscow Metro is recognized as the most beautiful underground railway system in the world. The Metro opened in 1935 and now it is the second largest underground railway system in the world. The Moscow underground has 177 stations and 7 million people travel on the Metro every day. The Moscow Metro map is like the London Tube map: it does not show true distances, it only shows how to get from one place to another. The Moscow Metro has beenaround for more than 70 years and has become part of our culture and history. To many, the Moscow Metro represents all that is great and beautiful in Russia.
Giraffe is the tallest animal in the world. Giraffe’s coat looks very beautiful and unusual. There are dark-brown patches on light hair. Giraffe has a large body and 4 long slim legs. The animal’s neck is longer than its body. This allows giraffe to reach for very high trees. Usually giraffes feed on leaves and small twigs. <span>There are two short horn-like structures and small ears on its head. Big black eyes are fringed with long thick eyelashes.</span>