Insert "to be able to" in the gaps.Pay attention to the conjunctions.

1)I ... to do these tests,because I work hard.
2)Nigar ... to understand the words of this song as she knows many English words.
3)My brother has many guialities and he ... to use modern computers.
4)They know four foreign languages and they ... to travel many countries.
5)Students ... to integrate the world education system.