Insert “few” or “little”.
1.There are very … old houses left in the street. Most of them have already been pulled down.
2.If you have … spare time, look through this book.
3.There are … things here that I can’t understand.
4.There is ... chalk on the desk.
5.He had … English books at home, so he had to go to the library for more books.

few, little, few, few, few

1 few2 little3 few 4 little5 fewLittle-для неисчисляемых имён существительныхFew-для исчисляемых имён существительных