After conditional 1, this week in Unit 7B you can have a look at Conditional 2, which is about hypothetical situations. This is something you know from previous levels, so it should not be difficult. The verb tenses that we use here are Past (translated as a Subjuntive) and Conditional.
Let me know if you have any problems with it .
The vocabulary section is about houses
Remember that you have the answer key to the exercises in the Blue pages in the Tests and Keys section.
And a song by Katie Melua to go with Conditional 2 sentences