viết lại các câu sau sử dụng gợi ý trong ngoặc: 1. [Because of his poor health], Henry does morning exercises every day. ( đặt câu hỏi cho cụm từ trong ngoặc vuông) 2. John didn’t know the truth until last week. (sử dụng cấu trúc: it was not until ...) 3. He wanted to pass the exam, so he studied very hard. (sử dụng to infinitive)