A sack is a type of large bag that is used to store things in. Sacks are most commonly used to store foods like rice and other grains, flour, and potatoes.
When you are sad, you are gloomy and don't smile. Sometimes you cry when you are sad. People get sad when someone they like goes away, or if they watch a sad movie or read a sad book. The person in the picture is sad.
A safety pin is a type of pin that has an extra loop of wire that covers the sharp end of the pin as well as stopping it from slipping out. Safety pins are often used to hold diapers or nappies together, or replace a missing button on your clothes until it is mended.
