Choose the words and replace them in the right form.not to

Choose the words and replace them in the right form.
not to meet, to take, to improve, come, not tu understand
I 1._________________ from Switzerland. I came to London six months ago to learn English. I 2.____________ many English people yet, only my teachers. I started learning English at school in Switzerland, when i was eleven. I 3.___________ anything, but now my English 4.____________ and i 5.___________ an exam.