1) We see things when..... enters our eyes a) Light  b) Shadow c) Sun 2) We....see objects in the dark because there is no light. a) Can b) Cannot 3) .....are artificial sources of light. a) Lamp, Sun, Star b) Galaxy, Firefly, Jellyfish c) Lamp, Torch, and campfire  4) ...are natural sources of light. a) Torch, bulb, galaxy b) Firefly, jellyfish, and stars c) Campfire, fireworks, stars 5) Light can be.....if look directly at the very bright light. a) harmful b) useful 6) The tree can form a shadow because... a) The tree blocks light from the sun b) The tree does not block light from the sun  c) The tree blocks the light from the sky 7) We need...to form a shadow. a) Sky b) Light c) Cloud 8) It is harmful to... a) Cover our eyes when there is bright light shining b) Switch on a light in a dark room c) Shine light directly into someone's eyes

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