Answer:
clinical trials test the safety and effectiveness of a drug or treatment. It is important that they be done correctly
Explanation:
Answer:
“the balloon speedy you rock it up into the truly bloodless air. We have been scared and apprehensive as it becomes shifting genuinely fast. However, it becomes all exact withinside the end
Explanation:
probably wrong
An abstract noun is a noun that you can't feel, hear, taste, smell, and see. Like hope. A concrete noun is a noun that you CAN feel, hear, taste, smell, and see.
So the abstract noun in this sentence is not choir, but harmony.
hope it helps!