In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

A lot of research has (1)______ that reptiles and amphibians are cold-blooded (2)______. By the term cold-blooded animals, we (3)_______ that they cannot control their body temperature like we can. A reptile’s skin is dry and scaly, (4)______ the skin of an amphibian is wet and smooth. Most reptiles spend much of their time (5)______ on land. Most amphibians live in or around water.