（）is the person who played the lead role in the research. A: Last author B: First author C: The third author D: The second-to-last author

In the last sentence of the second paragraph, the pronoun it refers to

Before her last jump, Tara was in second place.

In English, the nucleus usually occurs on the ________lexical item. A: last B: first C: second D: last but one

I didn't go to his party last night, because ______ I changed my mind. A: on a second thought B: on second thought C: by second thought D: on the second thought

This is the ________order between the two parties. A: First B: Second C: Last

The Last of the Mohicans, published in 1826, is the second book of _______ and often regarded as his masterpiece

Monday Is ______day of the week. A: two B: the two C: the last D: the second

Saturday is the ______ day of the week. A: first B: second C: last D: third

The economy of is the ___ largest national economy in the world and is the world’s second largest developed economy.（ ）. A: third B: first C: last D: second