----- Nội dung dịch tự động từ ảnh ----- 1. They send two million books to America every year. (passive voice) 2. They will open the new hotel next year. (passive voice) 3. The house is very beautiful. It was built last month. (Use past participle) 4. We turned off the lights. We didn't want to waste electricity. (Use so as (not) to)