Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges. Two friends Nam and Lan are talking about the topic of global warming.

Nam: What is the biggest environmental problem facing our country? - Lan: ____

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Land erosion is mainly caused by widespread deforestation.

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

In the past, a lot of countries denied having contributed to global warming.

Mark the letter A, B, C, or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

We must admit that people are heavily polluting the environment.

Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges. Two friends Nam and Lan are talking about the topic of global warming.

Nam: Do you do anything to protect the environment? - Lan: ____

Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges. Two friends Nam and Lan are talking about the topic of global warming.

Lan: What solution to air pollution can you suggest? - Nam: ____

Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges. Two friends Nam and Lan are talking about the topic of global warming.

Lan: How can ordinary people help protect the environment? - Nam: ____