The key to exercise solutions in chapter 10 - Grammar for the textbook New Headway Elementary - Workbook with authors Liz Soars, John Soars and Jo McCaul from Oxford University Press
Question
Match a line in A with a line in B.
Answer
I'm working hard because I need the money.
Jane's learning French because she's got a job in Paris.
The baby's crying because she's hungry.
Tom's studying hard because he has an exam soon.
You're making a lot of mistakes because you aren't listening.
Ken and Sally are cooking because friends are coming for dinner.