1. the operating system had been upgraded by that time (past perfect)
the operating system will have been upgraded by that time (future perfect)
2. they hadn't detected the bugs by that time (past perfect)
they will not have detected the bugs by that time (future perfect)
3. had the flowchart been designed by that time ? (past perfect)
will the flowchart have been designed by that time ? (future perfect)
4. the charger had stopped walking by that time (past perfect)
the charger will have stopped walking by that time (future perfect)
5. had you defined the purpose of the program by that time ? (past perfect)
will you have defined the purpose of the program by that time ? (future perfect)
6. they had made my own website by that time (past perfect)
they will have made my own website by that time (future perfect)
отметь мой ответ коронкой как лучший ответ
London is an ancient city. Today it is one of the most popular tourist cities in the world - many are attracted by its history and unique charm. Nothing like this can be found in any city in the world, despite the fact that there are enough truly interesting and original ones among them. Being in London on vacation is a great idea, just keep in mind that everything here is very expensive.
The coolest place in London for me is Buckingham Palace. Like Westminster Palace, the residence of the Queen of Great Britain is open to the public, but many people prefer to look at it from behind the gate. If you still want to know how monarchs live, you can join the excursion group. For € 40, you will be admitted to the ceremonial halls, gallery and stables, and will also lead you through the gardens laid out around the palace. But you can also choose cheaper excursions. Visit the official website for visiting hours and options for tours of Buckingham Palace.
I really liked London, I strongly advise you to visit it
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