----- Nội dung dịch tự động từ ảnh ----- 1 Match the sentence beginnings a to j with endings 1 to 10. 1 it produces magnesium oxide. 2 it lasts longer. a If you cool water to zero degrees, it b Most things expand c When magnesium burns in oxygen, d If x times y is six and x is three, 3 forms ice. 4 you get static electricity. e If you touch a live wire, f Green plants can't survive g When a bicycle speeds up, 5 you get an electric shock. 6 if you heat them. 7 it is more difficult to stop. h If you put food in a fridge, 8 when there is no light. If you rub a balloon with a cloth, 9 then y is two. į If you fill a balloon with hydrogen, 10 it floats in the air.