21. Their son is ________ years old.

Hello! I am happy to help you with your English test. Let's go through the questions one by one. **Grammar Part:** 21. Their son is twenty-four years old. (b) 22. She has got an eraser on the desk. (b) — We use "an" before a vowel sound. 23. Lynn usually wakes up at 5 o'clock. (b) — Present Simple for routine actions. 24. This is a picture of his family. The family is nice. (c) — We use "the" to refer to a specific noun already mentioned. 25. There is some/much sugar on the floor. (d) — "Much" is used with uncountable nouns like sugar. **Make the given words plural:** 26. class — classes 27. potato — potatoes 28. woman — women 29. tooth — teeth 30. foot — feet **Part 4. Vocabulary. Cross the odd word out:** 31. **Chinese** (The others are parts of the UK). 32. **go to bed** (The others are daily routines, often related to the beginning or middle of the day/eating, whereas go to bed is at night, or it's the only one not related to meals/daytime activity - though this is a bit subjective, "go to bed" is the most distinct phase). 33. **insects** (The others are mammals). 34. **table** (The others are kitchen/bathroom fixtures, table is furniture). 35. **arm** (The others are parts of an animal body, arm is human-specific). **Choose the correct word:** 36. What does it look like? It has fur and long ears. (b) 37. Can you help me to look for my cat? (c)