C. major (In the context of "main streets," it means important or principal.)
D. Because he can see many interesting things in the streets. (This is directly stated in the passage.)
A. The writer's house is very far from his school. (The passage says the journey is long, but doesn't explicitly state it's
very far.)
B. His classmates (The passage mentions walking with "some other boys from my class.")
My father spent most of his spare time looking after the garden. (took) → It took my father most of his spare time to look after the garden. (Or, more naturally: My father took most of his spare time to look after the garden.)
Linh's not fond of uploading our class photos to the forum. (detests) → Linh detests uploading our class photos to the forum.
We will have a short holiday. We will feel very stressed. (Unless) → Unless we don't feel very stressed, we will not have a short holiday. (Or, more naturally: Unless we feel very stressed, we won't have a short holiday.)
My mother always keeps the house neat and tidy. (habit) → My mother is in the habit of keeping the house neat and tidy. (Or, more simply: My mother has a habit of keeping the house neat and tidy.)