Will be changed 2020 indicates that life will be changed in the future.
He used to work in a small workshop, but now he is the boss of a big company. (work)
I became a boss after working, so the first half of the sentence is about the place where I used to work and the past tense.
I was having breakfast when my mother told me that there was a phone call for me.
When I was having breakfast, my mother told me balabala；; There is a hint in the sentence, indicating that it happened in the past, using was.
My niece has been to Sumatra and Iran, and all over Europe. By the time she was 20, she had been almost everywhere. (will/will be)
She must have been to almost all places when she was 20 years old, but the first half of the sentence said that she had been to Sumatra, Iran and the whole of Europe, not every place, so she used the subjunctive mood. She is not yet 20 years old and full of fantasies about the future.
8. Is this your first visit to Shanghai? (visit)
I have visited the fixed collocation, and I don't seem to know how to explain this.
Although people may get the latest news through TV, it is impossible for TV to completely replace newspapers. (replacement)
Will replce has not been replaced by the future tense.
I think there is nothing wrong with using the present tense upstairs.
Translation:
I wonder if our life will change by 2020.
He used to work in a small workshop, but now he is the leader of a big company.
While I was having breakfast, my mother asked me to answer the phone.
7. My niece has been to Sumatra, Iran and Europe. By the time he was 20 years old, he must have been to almost all places.
8. Is this your first visit to Shanghai?
9. Although people may prefer TV because of fast information, TV can't completely replace newspapers.