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The Moscow Metro.

The first line of the Moscow Metro was opened in 1935. Today the Moscow Metro is the 5th busiest metro and the largest metro in the world.  A lot of underground stations are landmarks. They look like underground palaces. The Moscow Metro consists of 13 lines with 203 stations (2017). Nearly all of them are underground. During rush hours the minimum interval between trains is 90 seconds. 7 million people travel on the Metro every day. The most popular stations are Pushkinskaya, Kitai- gorod, VDNH, Prospect Mira (Peace Avenue), Lenin State library, Arbatskaya, Botanicheskiy sad (Botanical garden) and much more. To many people, the Moscow Metro represents all that is great and beautiful in Russia.

1. Tim was angry; he had been waiting for us since seven o'clock! We apologised and then promised not to be late again.

To solve this sentence, we need to use the past perfect continuous tense because Tim had been waiting for us for some time before we arrived. Therefore, we use "had been waiting" as the correct form of the verb "to wait" in this sentence. The word "for" is also necessary to indicate the duration of waiting.

2. I was surfing the net in my room when I heard the cat meowing loudly. I didn't need to feed the cat because I had fed it ten minutes before.

In this sentence, the past perfect tense is used to indicate an action that occurred before another past action. Before hearing the cat meowing, I had already fed it. Therefore, we use "had fed" as the correct form of the verb "to feed" in this sentence.

3. We saw David and said hello to him. We invited him to go to the cinema with us, but he was too tired because he had been studying for the test all day long.

In this sentence, the past perfect continuous tense is used to indicate an action that started in the past and continued up until another past action. David had been studying for the test for the entire day, so he was too tired to go to the cinema. Therefore, we use "had been studying" as the correct form of the verb "to study" in this sentence.