Here's a nice dialogue between two friends about buying a new flat. The two friends use zero, first and second conditionals in context and the meaning behind those claues are questioned in the true/false comprehension questions. An answer key is provided along with some feedback notes which justifies the correct answer in the text.
What's the procedure?
There may be various ways to use this handout in ESL classes. In my opinion, it's best to accompany a grammar revision lesson on the relevant conditional clauses.
First, warm-up the class with questions about buying a new flat. You can ask several questions about the relation between their estimated prices and location or features. You can also review types of house before the activity. There's a picture of a flat and a detached house display on the worksheet for your convenience. Especially, it'll be a good idea to exploit the "detached house" photo, as its meaning is important for the comprehension of a second conditional clause in the text. Then, just ask your students to read and answer the questions in the worksheet.
In the feedback stage, ask your students for some evidence to support their answers. They are given in the feedback notes for your convenience.
As a follow-up activity, you can ask your students to identify conditional clauses in the text and then elicit the rationale behind the use of them.
There's also an online version of this material. You can try it before you take it to your class.