Replace one of the nouns with one or ones.

Замена существительных на 'one'/'ones':

1. These tickets are expensive. We can find cheaper ones. (Замена 'tickets').
2. This pen isn't good. I've got a better one in my bag. (Замена 'pen').
3. The black jeans are too big. The blue ones are much better. (Замена 'jeans').
4. All of the buses go there but the green one is the fastest. (Замена 'bus').
5. Where are my black shoes? They were next to my red ones. (Замена 'shoes').