Nhờ mn sửa bài giúp em ạ(nếu sai). Còn đúng thì thôi. Em cảm ơn ạ. ----- Nội dung dịch tự động từ ảnh ----- 15. 13. Henry the piano upstairs while his brother William was playing-was practising C. had played-practised 14. Tom B. wasn't playing - practised chess in the basement 12. John A. is his dog in the back yard when the community worker on the front door. A. hadn't fed-was knocking C. was feeding - knocked they to music or A. Did...listen - watched C. Did...listen - had watched D: played - hadn't practised B. fed knocked D. didn't feed - was knocking 13. Su their favourite TV show at seven thirty last night? A- B. Had...listened - watched D. Were...listening - watching C 4. E