英语翻译：许多年后我才有机会在英语国家练习口语

It was quite some years before I had the chance to practise spoken English in English-speaking countries.
The signs of warning are erected/ set up in those places where accidents frequently happened.
Sometimes you will still can't find your mistakes no matter how many times you examine your test paper.
The producers always spend a lot of money on advertising to make people believe their products.
Though I have swimming lessons with an swimming expert, I still can't swim well.
When I was riding around the campus, Jimmy help hold my bicycle.
They want to buy a flat in a quiet and nice/ beautiful environment.
Now many students don't follow their teachers' advice on English learning.
As he has got used to his own culture, he finds it hard to adapt to new one.
All has happened as expected.
She is firm where she thinks she is right.