For each question, choose the correct answer.
1. What is Alice Watson’s job now?
2. Demi had her first ballet lessons
3. Jack helped his wife and daughter by
4. What was the best thing about the Swan Lake show for Demi?
5. Hannah says that Demi

In this text it is told about boys. Once in the big stone hall boys ate. There was a furnace from where the owner scooped porridge. They got only 1 ladle. After meal they looked at the furnace, so, as if are ready to eat bricks of which the furnace is made. They suffered from hunger about 3 months. Once one tall boy told that he didn't get used to such and his father of owners of a small bakery. Then the idea came to their mind, and all decided that it will be made by Oliver Twist. In the evening when all mudflows at a table and after all ate, started winking at Oliver Twist. He took courage and approached the owner. It was very thick

Предлог for отвечает за длительность действия. В отличие от since, может находиться в предложениях любой группы времен (Present, Past, Future и т.д.). 
I have been living in London for 3 years.
We went to Paris for two weeks.
I will be away for 5 days. 
То есть, грубо говоря это означает "на протяжении какого-то времени"
Since употребляется только Perfect и означает, что действие, которое началось в ещё не закончилось сейчас.
We’ve been living in Boston since 2005 - Мы живём в Бостоне с 2005, то есть, мы жили там с 2005 и живем здесь и по сей день
I have known Natalie since April - Я знаю Наташу с апреля, то есть, как я её знала в апреле, то так я и знаю её сейчас.
Надеюсь, я понятно объяснила.