Meaning: "eternal" means lasting forever.

Wrong options:

• eternel: It has "e" where the word has "a". The right spelling is "eternal". Every letter must be correct to get the mark.
• eternally: "eternally" has an extra "ly" at the end. The speaker says "eternal".

Correct answer: explored

Explanation: Listen again to "scientists have explored the mystery". This already happened, so the word ends in ed.

Meaning: "explored" means looked into or studied.

Wrong options:

• explord: It leaves out the "e". The right spelling is "explored". Every letter must be correct to get the mark.
• explore: "explore" is missing the ending. The speaker says "explored", with "d" at the end.

Correct answer: extent

Explanation: Here you hear "to such an extent that". It comes after "an", so you need a word for a thing.

Meaning: "extent" means the level or degree of something.

Wrong options:

• extennt: It adds an extra "n". Write "extent". Only the exact spelling gets the mark.
• extant: This is a different word with a different meaning, so it is wrong here.

Correct answer: common

Explanation: The speaker says "it is now common place to". It comes before "place", so use "common" exactly.

Meaning: "common" means usual or often seen.

Wrong options:

• comon: It leaves out the "m". Write "common". Only the exact spelling gets the mark.
• commonly: "commonly" has an extra "ly" at the end. The speaker says "common".

Correct answer: produce

Explanation: You hear "to produce clones." After "to" you need the plain word for an action.

Meaning: "produce" means to make or create.

Wrong options:

• prodce: It leaves out the "u". The right spelling is "produce". Every letter must be correct to get the mark.
• produced: "produced" has an extra "d" at the end. The speaker says "produce".