Choose A, B, C, or D that best completes each sentence.

Certain _______  in the atmosphere, such as carbon dioxide, methane and nitrous oxide, block heat from escaping.

Choose the best answer.

Greenpeace works to promote public                of the dangers that threaten our planet today.

Choose the word or phrase that is CLOSEST in meaning to the underlined part in the following questions.

Some hold the view that an increase in interspecies competition leads to local extinctions and a decrease in diversity.

Choose the best answer.

A strong greenhouse effect will warm the oceans and partially melt glaciers, increasing ______.

Choose the sentences that are closest in meaning to the given sentence(s).

As he had drunk too much, he didn’t drive home himself.

Identify an error in each sentence.

Joyce thanked us inviting (A) them to dinner (B) and said (C) that they wanted to have us over (D) for dinner next week.

Choose the best answer to fill in the blank.

______ off the light, we went to bed.