Text: exercise: regular exercise can keep you healthy and guard against infectious attacks.

Correct capitalization: Exercise: Regular exercise can keep you healthy and guard against infectious attacks.

Text: colour: black, glossy finish.

Correct capitalization: Colour: Black, glossy finish.

Text: grapefruit (citrus x paradisi) contains the flavonoid naringenine, which has been shown in laboratory studies of be able to reduce the spread of the hepatitis c virus from infected cells.

Correct capitalization: Grapefruit (Citrus x paradisi) contains the flavonoid naringenine, which has been shown in laboratory studies of be able to reduce the spread of the hepatitis C virus from infected cells.

Text: basically attaching is to bind branches to the fence.

Correct capitalization:
Basically attaching is to bind branches to the fence.