Fill in the gaps with the necessary variant. Вставь один из предложенных вариантов ( )

These houses (were, was, are) built in 1899.

Portugal ( was visited, is visited, visited) by million tourists every year.

Is there (some, any, no) butter in the fridge?

There is a business center (on, in front, in front of) the mall.

He is (as tall as, tall as, isn’t tall as) his brother.​

Titan Thanos (Josh Brolin) managed to collect the Infinity Stones and destroy half of the universe with a snap of his fingers. Despite all their efforts, the Avengers have lost this battle - and now they will have to live in a world that is impossible to get used to. Or not: Returned from the quantum world, Scott Lang (Paul Rudd) seems to have come up with a solution. Now the defenders of the Earth have a second chance - for redemption and the return of the world to its former state. The Avengers have nothing to lose and are ready to re-enter the battle and win this time. At any cost.

решение. 1. ri=2*r; rii=r/2; ri/rii=4; не надо ни о какой площади сечения говорить. два куска проволоки содинили последовательно, получили ri=2*r; два куска той же проволоки соединили параллельно, получили rii=r/2; ну, а теперь раздели первое на второе!

а теперь общий случай: ri=r*n; rii=r/n; ri/rii=n^2; кусок проволоки разрезали на n одинаковых кусков. сначала эти куски соединяют последовательно: ri=r*n; затем соединяют параллельно rii=r/n; ну и дели первое на второе и делай выводы.