3- Looks like Sansevieria trifasciata (snake plant aka mother-in-law’s tongue). Best wishes! http://davesgarden.com/guides/pf/go/431/

2- Again with with out flowers to help with its ID. I’m guessing a species from these genera: Dasylirion, Yucca and Nolina? I’m leaning toward the Dasylirion genus. Link below with information for the mentioned genera. Best wishes! http://www.saguaro-juniper.com/i_and_i/agavesNyuccas/agavesNyuccas.htm

1- Maybe a type of cholla cactus (Cylindropuntia)? With out its flowers to help narrow down its ID, I’m guessing it is either C. imbricata (cane cholla) or C. fulgida var. mamillata (chain fruit cholla, smooth chain fruit cholla and boxing glove cholla). Check it out and see if you have a match. Click on any images from link below to enlarge. Best wishes! https://www.google.com/search?q=Cylindropuntia+imbricata&sa=X&stick=H4sIAAAAAAAAAONgFuLUz9U3sDDISClTAjPNDY0KkrQss5Ot9JMy83Py0yv184vSE_Myi3Pjk3MSi4sz0zKTE0sy8_OscvLLU4sUUAWLAeGcmS9TAAAA&biw=1867&bih=909&tbm=isch&tbo=u&source=univ&ved=0ahUKEwjpmK2jv9POAhWJ4SYKHU-8AYsQiR4IlQE#tbm=isch&q=cylindropuntia+fulgida&imgrc=_