Question : Comprehension:
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.

Question:
Select the most appropriate option to fill in the blank No. 3.

Option 1: to observe

Option 2: observing

Option 3: observe

Option 4: observed

Question : Comprehension:
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.

Question : Comprehension:
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.

Question : Comprehension:

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

Question : Comprehension:
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 greenhouse1.

Question : Comprehension:

In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Global warming is one of the biggest environmental (1)_________ facing the world