1)Big snapping turtles don't get to weigh so much without eating a lot of food. (2)Here's how they do it: (3)Most snapping turtles float, or lie motionless on the bottom of a pond or river. (4)_____ a fish, frog, or other prey swims close enough, the turtle snaps very fast with powerful jaws.
Options: a. Also b. Moreover c. Before d. When
