1. the air/ now/ polluted/ heavily/ traffic fumes//
-> The air is now polluted heavily by the traffic fumes
2. these math problems/ difficult/ us/ find/ answer//
-> These math problems are difficult for us to find the answer
3. this house/ I/ born.
-> This house is where I was born.
4. I/ interested/ learn/ English/ and want/ improve/ speaking skill//
I am interested in learning English and I want to improve my speaking skill.