In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Human activities are changing Earth's natural greenhouse 1. ________. Burning fossil fuels like coal and oil puts 2. _______ carbon dioxide into our atmosphere. NASA has 3. _______ increase in the amount of carbon dioxide and some other greenhouse gases in 4. _______ atmosphere. Too much of these greenhouse gases can 5. ________ Earth's atmosphere to trap more and more heat. This causes Earth to warm up.