----- Nội dung ảnh ----- 6. The house, ______________ they bought three months ago, looks lovely. 7. Mrs. Jackson, ______________ had been very ill, died yesterday. 8. She is the woman ______________ sister looks after the baby for us. 9. The dog, ______________ had been very quiet, suddenly started barking. 10. I didn’t receive the letters ______________ she sent me. 11. Complete the sentences with relative pronoun or adverb.