15. He is teaching English in high school.
-> What is he doing in high school?
16. The homework is very difficult
-> How is homework?
17. She often does the housework after doing exercises.
-> When does she often do the housework?
18. They are planting some roses in the garden.
-> How many roses are they planting in the garden?
19. Liz is sending these letters to her friends.
-> Who is being sent these letters by Liz?
20. My favourite subject is Math.
-> What subject do you like? / What is your favourite subject?
21. Yes, we do. (We have magazines and newspapers)
-> Do you have magazines and newspapers?
22. I often listen to music in my free time.
-> What do you often do in your free time?
23. Yes, he is. (He is good at drawing)
-> Is he good at drawing?
25. She learns about computers in computer science class.
-> What does she learn in computer science class?