Study the theory of 1.3 Relative Clauses A-D on Learnbeat
Do the exercises belonging to 1.3.C and 1.3.D. Ready? Do ex. E2-4 on LB.
Prefer working in your GRO exercise book? Do ex. 4, 5 on p. 67 and 68.
You can find the theory on p. 74 to 82 in your GRO book.