XV
1. you should take a bus to get to the department store
2. It would be a good idea to go camping this weekend
3. People will be surprised when they know about Soon Dong cave 
4. Winsor castle is one of the most beautiful castles in the world (câu này mình không nhìn được chữ cuối cùng nên chữ này mình không chắc nhé ^^) 
5. There are lot of trees on the way to my school
XVI
1. There is one protector ,one computer in each classroom in my school
2. We are going to visit him on Tuesday next week
3. Dave is  better at Maths tests than Mary
4. The Great Pyramid of Giza is one of the greatest pyramid in the world
5. Students should learn in groups to help each other