4. Read the advertisements again. Write DS for dog sledding, CNT for CN Tower, and NF for Niagara Falls. You can write several of them next to the sentences. 1. MF You can watch a presentation about its history. DS, NF You can enjoy spectacular scenery. You can have a meal there. You need to wear warm clothes. You can watch it by flying over the top, coming as close as possible to it by boat, or by standing far away from it. 6. You can take an elevator to get to the top of it. You can be close to animals. 8. You can visit it at night as well. 9. Its walls and doors are made of glass. 10. You need to take a lesson before doing it.