fundamental(adj) 2. approach (v) (n) 3.complex(adj) 4.medium(adj) 5.significant(adj) 6.expense(n) 7.cause(n) (v) 8.strength(n) strengthen(v) 9.energetic(adj) 10.give it a try 11.dozen(n) dozens of 12.pond(n) 13.presentation(n) 14.generous(adj) 15.curious(adj) 16.within walking distance 17.regret(v/n) 18.drop out of school 19.ecology(n) 20.grateful(adj) 21.sympathetic(adj) 22. be supposed to 23.apartment(n) 24.carpet(n) 25.equip(v) 26.adequate(adj)