1. Nam and Mary have been pen pals for over four years.

2. I used to walk past the temple on the way to primary school when I was a little boy.

3. It is very difficult for Vietnamese students to study abroad.

4. A new stadium will be built in this area next month.

5. After finishing the degree in English, she went on studying Law at Harvard university.

1. Nam and Mary have been pen pals for over four years.

2. I used to walk past this/the temple on my/the way to primary school

when I was a little boy.

3. It is very difficult for Vietnamese students to study abroad.

4.  A new stadium is going to/ will be built in this area next month.

5. After finishing degree in English, she went on studying Law at Harvard university.