Complete the second sentence so that it means the same as the first
1. He opened the window. He wanted to let fresh air in. (in order to)
2. Study hard or you will get bad marks. (Unless)
3. My study room has two chairs and one table. (There)
4.1 think no country in the world is more beautiful than Vietnam. (most)
5. The last time I ate this kind of food was 6 months ago. (haven't)