Based on the passage, identify pairs of antonyms and select the correct statements about trees.

The passage states: "It gives us oxygen..." and "We should take care of the trees." The words "give" and "take" are both present in the passage and are opposite in meaning.

• (1) give x take: Both words are in the passage and are antonyms.
• (2) friend x enemy: "friend" is in the passage, but "enemy" is not.
• (3) our x their: "our" is in the passage, but "their" is not used as a pronoun in the passage.
• (4) best x good: "best" is in the passage, but "good" is not used as an opposite. The correct pair of opposite words found in the passage is give x take. The correct option is (1).

Let's check each statement against the passage:

• (1) Trees take carbon dioxide and give oxygen: The passage states "It gives us oxygen", but it does not mention that trees take carbon dioxide.
• (2) Trees are our friend: The passage states "Trees are the best friends of humanity."
• (3) Trees give us fruits, wood etc.: The passage states "They give us fruits, shadow, wood, purify air etc."
• (4) We should take care of trees: The passage states "We should take care of the trees." The statement not mentioned in the passage is that trees take carbon dioxide and give oxygen. The correct option is (1).

The passage states: "It gives us oxygen, which we need to breathe."
Therefore, oxygen is needed to breathe.
The correct option is (2).

"Milk" is an uncountable noun. Uncountable nouns generally do not have a plural form in the traditional sense (by adding -s or -es). When referring to the substance, the word "milk" is used for both singular and plural contexts. While "milks" can be used to refer to different types of milk, the most grammatically accurate answer for the plural form of an uncountable noun, without specific context, is the singular form itself.
The correct plural form of "Milk" is milk.
The correct option is (4).

The sentence is "They ____ playing."
The subject "They" is a plural pronoun. The verb must agree with the plural subject.

• (1) is: Used for singular subjects (e.g., "He is playing").
• (2) was: Used for singular subjects in the past tense (e.g., "He was playing").
• (3) are: Used for plural subjects in the present tense (e.g., "They are playing").
• (4) has: Used for singular subjects (e.g., "He has played"). The correct verb is are. The correct option is (3).

Final Answers:
Q.90: The correct pair of opposite words found in the passage is (1) give x take.
Q.91: The thing not mentioned in the passage is (1) Trees take carbon dioxide and give oxygen.
Q.92: The thing needed to breathe is (2) oxygen.
Q.93: The correct plural form of "Milk" is (4) milk.
Q.94: The correct verb to fill in the blank is (3) are.