rheostats

"The amount of time it takes to finish my homework is a variable; sometimes it takes me an hour, other times it takes much longer. "

"The science teacher conducted an experiment to demonstrate how plants grow in different types of soil. "

"the resistance of bacteria to certain antibiotics"

"The river continuously flows to the sea, it will never pause to let us cross on dry land."

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"During the occupation, many brave people acted as resistors, hiding refugees and sabotaging enemy supplies. "

"The brightness of the classroom light made it easy to see the teacher's notes. "

"He is a student of life."

"My brother is a talented electrical. "

"The government has complete control over the situation."

"Of course in my opinion Social Studies is more of a science than an art."

"The airport has three terminals, so make sure you know which one your flight leaves from. "