Объедините предложения, используя слова в скобках i'll find the book. i'll letyou know. (if) i'll study english. i'll speak it perfectly. (until)

If I find the book, I'll let you know.
I study English, until I'll speak it perfectly.

1.You will miss the train if you don`t take a taxi.
2. I won`t go away till you come back .
3.I`d like to know when your sister comes back to Leningrad .
4. I would like to know the day your sister comes back to Leningrad .
5. I was not sure if he would be at the meeting, but if he comes he will debate.
6. While the ladies are at their rooms, I will come downstairs and try to get you something to eat.

1. When I find Olya and bring her here, I will call you.
2. When I  find Olya and bring her here, I won`t go away, until  I get her address.
3. When I find Olya and bring her here, I will marry her when I`m twenty three at that.
4. When I find Olya and bring her here and if you kill me, I won`t miss.
5. When I find Olya and bring her here, I don`t know whether I can explain to you how it works. 

Michael could not imagine his life without computers. His parents bought__ him his first computer at the age of seven. It took him__ several days to learn how to use it. His mum said that the younger people were, the fastest__ they could learn computer skills. That was probably true – most children__ in Michael’s class were very competent computer users. Michael was really surprised to find out that the first personal computer was invented__ in the 70’s of the last century. 
“And how did you chat or send your e-mails without computers?” he asked his mother. 
She smiled: “We didn't send__ each other e-mails. And there were no networks.”
She also said that it had been fun__ fun to communicate face-to-face, to play out-of-doors and to visit friends’ homes.
“But if there were __ no computers, I wouldn’t be able to communicate with my friends who live far away from me,” Michael replied.
“True. Technological progress is a great thing,” his mother said “And I think people will create_ even more amazing communication devices in the near future.”