Exercise 1. Опираясь на образец, дополните предложения в the Past Perfect Continuous Tense. Example: … before we came from the supermarket. Liz/ to clean/the flat/for two hours.— Liz had been cleaning the flat for two hours before we came from the supermarket.

… before Tom came to the court. Helen/to play/tennis/for an hour and a half.

… before he retired. Mr Black/to work/as a lawyer/for twenty-five years.

… when the bus arrived. We/ to wait/f or forty minutes.
Sheila looked tired because She/to sew/a dress/for her little daughter/all day.

Before Jack got to level four …. Не/to play/the same game/for three hours.

Mike’s neighbours were angry because …. Не/to listen/to loud music/for four hours/yesterday evening.

Everybody was very hungry because …. They/to work/all day/without/а break for lunch.

… when suddenly the car broke down. We/ to drive/for five hours.

… before the plane landed in the airport late in the evening yesterday. They/to fly/for six hours.

… since Easter. Alex and Den/to prepare/for the exams.​

1) Have you read the letter from Aunt Emily yet? — Yes, I have. She wants to visit us. She will come next Wednesday. 2) Why are you looking at that woman so attentively? Do you know her? — It seems to me I have already met her somewhere. 3) Is Jane in the office? Yes, she has been typing some documents since 9 o’clock. 4) The police inspector  has been investigating this robbery for a week now. He has talked to all the witnesses already but he hasn't found the robbers yet. 5) I don't know how long Henry has been working on that project, but he hasn't finished it yet. 6) The secretary usually comes to the office at 9 o’clock, but it is half past nine now and she hasn't arrived yet. 7) Is Den in his room now? What has he been doing there since morning? — He has been preparing for the research expedition. He has booked a plane ticket already and now he is packing his things. 8) Are you OK, Nigel? You look very pale.— l am just tired. Ihave been working on mj^ report all night. 9) Who has been training in the gym for half a day now? — Ben and Alex. They have been preparing for an international championship for eight months now. They train every day. 10) How long has Nelly been painting this picture? — She has been painting it for a month now. She wants to exhibit it in our gallery next month.

Объяснение:

Every year, millions of tourists come to London to see and listen tp Big Ben. But, what exactly is Big Ben?

Most people think that Big Ban is the tall clock tower that stands above the Houses of Parliament. Well no! Big Ben is not the clock tower. It is one of the four huge bells inside the tower. Its name comes from the bell`s commissioner of works, Sir Benjamin Hall, or Ben. The tower is 98 meters high. The bell inside the tower is 14 tons. The clock on the tower is also huge. Each of the four clock faces is 7 meters wide. The hour hands are about 3 meters long and the minute hands are about 4 meters long.

Perhaps one day you can go to London and see this amasing tourist attraction.