Meaning: "laboratory" means a room or building for scientific work.

Wrong options:

• labratory: It leaves out the "o". The right spelling is "laboratory". Every letter must be correct to get the mark.
• lab: The sentence needs the full word for the place, not the short form.

Correct answer: exploring

Explanation: Here you hear "two years exploring the". After 'years' you need an action word that ends in ing.

Meaning: "exploring" means looking around or studying a place.

Wrong options:

• explore: "explore" is a close word, but it ends in "e". The speaker says "exploring", which ends in "ing".

Correct answer: sedimentary

Explanation: The speaker says "mound of sedimentary deposits". You need a describing word that ends in ary.

Meaning: "sedimentary" means made of layers of sand, mud, or small rocks.

Wrong options:

• sedimentery: It has "e" where the word has "a". Check the letters: "sedimentary". A small spelling mistake loses the mark.
• sediment: "sediment" is missing the ending. The speaker says "sedimentary", with "ary" at the end.

Correct answer: sequence

Explanation: You hear "landing sequence which appears". The sentence needs a word for a series of steps.

Meaning: "sequence" means a series of events or steps in order.

Wrong options:

• sequance: It has "a" where the word has "e". The right spelling is "sequence". Every letter must be correct to get the mark.
• sequences: "sequences" has an extra "s" at the end. The speaker says "sequence", with no "s".

Correct answer: landing

Explanation: Listen for "challenges of landing on Mars". You need a word for the act, ending in ing.

Meaning: "landing" means the act of coming down and touching the ground.

Wrong options:

• landng: It leaves out the "i". The right spelling is "landing". Every letter must be correct to get the mark.
• land: "land" is missing the ending. The speaker says "landing", with "ing" at the end.