Statement 1 -  In bond-line structural representations, only atoms specifically written are oxygen, chlorine, nitrogen etc.
Statement II - In bond-line structural representations, line junctions denote carbon atoms bonded to appropriate number of hydrogens required to satisfy the valency of the carbon atoms.

Both the Statements I and II are correct. In bond-line structural representations, only atoms specifically written are oxygen, chlorine, nitrogen etc. Also, the terminals denote methyl (-CH₃ ) group, while line-junctions denote carbon atoms bonded to appropriate number of hydrogens required to satisfy the valency of the carbon atoms.