Fill in the Blanks (Reading & Writing)

Pearl farming begins by —insertinginsertinsertedinsertion a tiny irritant, often a bead of shell, into an oyster to trigger the —secretionsecretingsecretessecreted of nacre. Farmers then —suspendsuspendedsuspendingsuspends the oysters in submerged cages for several years, monitoring water quality closely since pollution can —ruinruiningruinedruinous the entire harvest. Only a small —proportionportionproportionalamount of cultivated oysters ultimately yield pearls of gem quality.