Meaning: "worldwide" means all over the world.

Wrong options:

• wordwide: It leaves out the "l". Check the letters: "worldwide". A small spelling mistake loses the mark.
• world wide: The sentence needs one word without a space.

Correct answer: natural

Explanation: Here you hear "The destruction of natural ecosystems". It comes before ecosystems, so you need a describing word.

Meaning: "natural" means not made or changed by people.

Wrong options:

• natrual: Two letters are in the wrong order. Write "natural". Only the exact spelling gets the mark.
• native: "Native" is a different describing word and does not fit here.

Correct answer: exception

Explanation: The speaker says "there seems to be an exception". It comes after 'be an', so you need a word for a thing.

Meaning: "exception" means something different from the usual rule.

Wrong options:

• execption: Two letters are in the wrong order. Write "exception". Only the exact spelling gets the mark.

Correct answer: studying

Explanation: You hear "have spent several months studying satellite". It follows 'months', so the action word ends in ing.

Meaning: "studying" means looking at and checking carefully over time.

Wrong options:

• studing: It leaves out the "y". The right spelling is "studying". Every letter must be correct to get the mark.
• studies: "Studies" is a different word form and does not fit after 'months' here.

Correct answer: exist

Explanation: Listen for "that exist since the 1970s". It comes after 'that', so you need a short action word meaning are there.

Meaning: "exist" means are there or are present.

Wrong options:

• exsist: It adds an extra "s". Write "exist". Only the exact spelling gets the mark.
• existed: "existed" has an extra "ed" at the end. The speaker says "exist".