Đáp án
1.A friend of mine has come back from the UK after a long vacation.
2. Hundreds of people will join the carnival in Rio de Janeiro next month.
3. Last year, I went on an expedition to the North Pole.
4. I hope I can visit the longest river in Europe, the Volga, in the future.
5. People used to believe that the Sun and all the stars orbited around the Earth.
6. I often pay a visit to the local museum on Sunday.
7. Mary has taken care of all the members of our team since we set off for London.
8. I have always wanted to climb Mount Everest since I was a boy.
