21. Our dream house will be located ............... the sea. A. between B. in C. on 22. Don't ............... old things because perhaps you will need them later. A. throw B. throw away C. throwing 23. ............... causes many breathing problems. A. Fresh air B. Fresher air C. Polluted air 24. In the future, cars might use energy from .............. A. power B. water C. oil 25. If you eat ............... fastfood, you will be fatter easily. A. too much B. very C. very much