D. standing by
Feedback stand by - 1. to do nothing to help someone 2. to keep a promise 3. to be on somebody's side and support them 4. to be ready to do something.
throw out - 1. to get rid of something 2. to expel somebody from a school or organization. 3. to reject an idea or suggestion. 4. to spread something into the air.
turn over - 1. to pass something to someone such as company or project 2. to use land etc. for a different purpose 3. to earn a certain amount of money 4. to change channel on a TV 5. to turn over a page means to go to the opposite side.
put in - 1. to install 2. to make efforts 3. to interrupt somebody by inserting a remark