Question 3. Theoretically speaking, the world will not be perished if everything turns into gold. -> Should everything not turn into gold, the world will be perished. Question 4. Most of the greatest creations on Earth were made thanks to theoretical science. -> If it hadn't been for the theoretical science, none of the greatest creations on Earth would have been made. Question 5. Technological advancement gave birth to better life quality and health care. -> If it hadn't been for technological advancement, better... care would not be gave birth. (mọi người check giúp mình đúng ko ạ, mình cảm ơn trc ạ!!!!!!!!)