1) If a metiorite hadn't fallen in Mexico, many dinosaurs ........................... . a) Didn't desappeared b) Not disappear c) Wouldn't have disappeared d) Couldn't desappear 2) So many people wouldn't have died, If the nuclear reactor in Chernobyl ........................ . a) Hadn't exploded b) Didn't explode c) Don't exploded d) Shouldn't have exploded 3) If a severe drought ....................... Bengala in 1770, it wouldn't have caused what is known as The Great Bengal Famine a) Is hitting b) Hadn't hit c) Hit d) would hit 4) If poaching hadn't existed, there ......................... more animal species in the world a) Would be b) Had been c) Would have been d) doesn't be 5) if it had rained every day, there ............................. floods in many places. a) Don't be b) Would have been c) May be d) Been 6) We ....................................  the forest so much, If we ................................ better the paper a) Didn't clearcutting / have leverage b) Clearcutting / has leveraged c) Clearcut / leveraging d) Wouldn't have clearcut / Had leveraged 7) If in the last month I ......................... energy-efficent light bulbs, I .............................. so much for electricity a) Has put / Will pay b) Had put / Wouldn't have paid c) Putting / Paying d) Am putting / Could paid 8) If the Global warming ............................., the icebergs ................................. . a) Have existed / Could melt b) Hadn't existed / Wouldn't have melted c) Existing / would melt d) Has exist / wouldn't have melted 9) If the pollution ......................... present in the world, We wouldn't have had to combat it. a) Hadn't been b) Have be c) Would have been d) Should be 10) If the ships .................................. oil slicks, many fish ...................................... . a) Have have / Could died b) Hasn't have / Will die c) Hadn't had / Wouldn't have died d) Had had / are dying

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