2 1) What is faster
(fast) car in the world?
2) Travelling by train is cheaper (cheap) than
travelling by plane
3) A cafe is
(busy) than a museum. (busy -
это не только занятой, но и оживленный)
4) A library is quiet (quiet) than a funfair,
5) The new swimming pool is big
(big) in
the city​

2 и 6 будут Past indefinite 
Остальные ,соответственно,- Present Perfect
I have built a house.
I have built a house when he came out of school
I have never built houses
I haven't built a house
Have you ever built a tower?
We built a house today
I have not yet learned words
We haven't made tutorials
They have never seen a crocodile
They haven't seen yesterday the crocodile

Так. На заметку.
Время Present Perfect обозначает действие, которое завершилось к настоящему моменту или завершено в период настоящего времени

Время Past Simple(indefinite) используется для обозначения действия, которое произошло в определенное время в и время совершения которого уже истекло

My name is Nikita. I'm 13 years old and I'm a secondary school student. My native town is Voronezh. Every year in September we celebrate a special holiday - the City Day. It usually falls on the third Saturday of the month. The holiday commemorates the date of city foundation. In my opinion Voronezh is a beautiful city of great importance for the country. Sometimes our History teacher lectures us about the history of the city. I know that it was founded in 1586 not far from the River Don. By the 17th century it was one of the most valuable trade centers of Russia. In the time of Peter the Great the city became famous as the cradle of the navy and merchant marine. The first remarkable event took place in 1860, when the monument to Peter I was established. At the end of the 19th century there were many new enterprises, plants, libraries, and theatres built in the city. One of the main educational institutions of the country, the Voronezh State University, was founded in 1918. Hopefully, in the future I will be studying there at the biological faculty. Today, our city is actively growing and developing. Surprisingly, the world’s first supersonic passenger aircraft Tu-144 was created here. Local citizens are fond of the City Day celebrations and I’m proud to be the part of it. Every year, my family and I participate in various festive events on this day. In the afternoon we observe the cheerful processions and parades or hear the speech of municipal authorities. I especially like the evening part, which is followed by the concert, featuring popular artists, and massive fireworks.