Fill in the correct article: 21. … books are very expensive.
22. … life can be difficult.
23. Emily is leaving on … 10.30 plane.
24. Do you drink … beer?
25. I like watching … sport on TV.
26. My second brother is … engineer.
27. It’s hot in here. Can I open … windows?
28. She stood at … door for a long time looking at … moon.
29. Most people like … children.
30. John’s very interested in … science.