что мне вставить There (wiil be, were, are) a lot of people in the zoo last month.​

There were a lot of people in the zoo las month

Думаю are будет правильно

Have been tested - Новые три вагона поезда-цистерны были испытаны в суровых зимних условия на ж/д в Аляске.
will have been completed - Строительство моста и дамбы будет закончено к началу сезона навигации.
are being constructed - В настоящее время в Европе и Азии строятся 2500 км скоростных линий.
maintains - система кондиционирования воздуха всегда поддерживает оптимальную температуру и влажность в вагоне.
is being built - В настоящее время новая высокоскоростная железнодорожная линия строится на севере России. 
has caused - Потоп значительно повредил железнодорожную ветку.

Объяснение:

Many people dream of traveling to different countries. Great Britain is one of the best places where people can go to.

I would like to visit Great Britain. There are many wonderful sights there. First of all, I would like to go to the park of entertainments in London.

They say you can see the most distant corners of London from the London eye. Secondly, I would like to go to the Loch Ness Lake where the Loch Ness monster lives. Thirdly, I would like to visit Buckingham palace and to talk to Elizabeth the II, the queen of England.

But on the other hand, I heard that not everything is so good in Great Britain. On the Internet I read that in London there is criminality. Streets on suburbs of London are dirty and ugly. But the worst thing in Great Britain is weather. It is raining cats and dogs.

I heard many different things about Great Britain. I don’t know if they are true. I believe that to know more about this country you should visit it.