Part 1: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 28. (1.0 pt). Scientists therefore agree that it is time (25) _________the spread of global warming before it is too late. Solar radiation and volcanic emissions (26) _________produce natural global warming. Yet, the major responsibility for turning global warming into a potential dangerous activity falls on humans. Ever since the Industrial Revolution, the burning of fossil fuels to power cars and generate electricity (27) _________to the ever-increasing emission of toxic carbon monoxide and carbon dioxide into the atmosphere. These gases trap heat and lead to the formation of the so-called greenhouse effect, which in turn (28) _________global temperatures. Only decisive government measures will curb down and limit the growth of this destructive effect on our planet. Question25: A. stop B. to stop C. stopping D. stops Question26: A. doubt B. doubted C. doubtfully D. undoubtedly Question27: A. has led B. have led C. leading D. lead Question28: A. rises B. raises C. lies D. lay