Meaning: "liquids" means more than one liquid substance, like oil and water.

Wrong options:

• liqueds: It has "e" where the word has "i". Write "liquids". Only the exact spelling gets the mark.
• liquid: "liquid" has no "s" at the end. The speaker says "liquids", so write the "s".

Correct answer: blend

Explanation: On the recording you hear "added here to blend them". After 'to' you need an action word in its basic form.

Meaning: "blend" means to mix two things together.

Wrong options:

• blends: "blends" has an extra "s" at the end. The speaker says "blend", with no "s".

Correct answer: exposed

Explanation: Listen again to "When exposed to UV light". The sentence needs the describing word that ends in ed, not the plain word.

Meaning: "exposed" means put into or left under light like UV light.

Wrong options:

• expsoed: Two letters are in the wrong order. The right spelling is "exposed". Every letter must be correct to get the mark.
• expose: "expose" is missing the ending. The speaker says "exposed", with "d" at the end.

Correct answer: alternative

Explanation: Here you hear "current alternative which involves". You need a word for another choice or method, not the same one.

Meaning: "alternative" means another choice or method.

Wrong options:

• alternitive: It has "i" where the word has "a". Write "alternative". Only the exact spelling gets the mark.
• alternatives: "alternatives" has an extra "s" at the end. The speaker says "alternative", with no "s".

Correct answer: centrifuges

Explanation: The speaker says "high energy centrifuges". The word means more than one machine, so add s at the end.

Meaning: "centrifuges" means machines that spin samples very fast.

Wrong options:

• centrifugees: It adds an extra "e". Write "centrifuges". Only the exact spelling gets the mark.
• centrifuge: "centrifuge" has no "s" at the end. The speaker says "centrifuges", so write the "s".