valid

"His anger was justifiable given the unfair treatment he received at work. "

"Plants use photosynthesis to make their own food from sunlight, water, and air. "

"The new student joined the school club in accordance with the guidelines. "

"The project consists of three main parts. "

"Regardless of the rain, she went to school. "

"We need to find an acceptable present for Jeff."

"The conclusion of the meeting was that everyone would work on the project together. "

"The politician's statements about lowering taxes and increasing government spending were a clear contradictory. "

"The ordination of priests is a significant event in the church. "

"The teacher's comments about my presentation were pertinent to the topic of marketing strategies. "

"His attendance at school was inconsistent; he missed several days in a row, then showed up for a few days straight. "

"The explanation was long and drawn-out."