----- Nội dung dịch tự động từ ảnh ----- V/ Rewrite the sentence without changing the meaning 1. Keeping the environment clean is very important. - It's . 2. It's three years since I last spoke to her. - I haven't. 3. Lan will be fifteen next week. - It is Lan's 4. How long is it since you used the pen? - When
