Explanation:

- Communication plays a (1)______ role in the overall development of man.

- This sets the stage for why communication is vital for personal and professional growth.

- Potential words: "crucial," "important," "significant."

- It can be learnt by our (2)______ efforts.

- Emphasizes the need for active participation to master communication skills.

- Potential words: "personal," "individual," "dedicated."

- Today, success in our professional life depends on our (3)______ to read, write and speak well which results in effective communication.

- Highlights the importance of various communication abilities in career success.

- Potential words: "ability," "skill," "competence."

- Barriers (4)______ communication hinder the communication process.

- Describes how obstacles can disrupt effective communication.

- Options:

- to: Suggests the idea of barriers opposing or obstructing communication.

- "by" or "against" would imply barriers are acting with or for communication, which is not correct.

- "from" implies a separation rather than an obstruction.

- It is very important to (5)______ these barriers so that the transmission of the message can be smooth.

- Stresses the need to overcome or eliminate these barriers in communication.

- Potential words: "overcome," "address," "resolve."