1) Studying abroad seems difficult but interesting to many students.
CHALLENGING
Students understand how challenging it is.(to study abroad)
2) Studying abroad is similar to studying at one's home college.
DIFFERENT
Studying abroad is not different from studying at home.
3) When you are abroad you can miss your relatives very much/
DEPRESSED
While abroad you feel (are) depressed because you can't see parents and relatives.
4) You are in charge of all your things.
RESPONSIBLE
You are responsible for everything.
5) You can learn a lot about yourself and the world while studying abroad.
BEST
Studying abroad is the best experience you can have
I have worked in school since 2008. Я работаю в школе с 2008 года.
I have been running for 2 hours. Я бегу уже два часа.
She has watched TV for 3 hours. Она смотрит телевизор в течение 3 часов.
I haven't seen my aunt for a long time. Я не видел мою тётю в течение долгого времени.
He has lived in London for two years. Он живёт в Лондоне 2 года.
Ann has studied English for three years. Энн изучает английский 3 года.
I have known him since June. Я знаком с ним с августа.
My brother has helped me since 11:00 this morning. Мой брат мне с 11 утра.
My sister has been working in the airport since February. Моя сестра в аэропорту с февраля.
I have done my homework for 2 hours. Я делаю домашнюю работу уже 2 часа.
Объяснение: