Meaning: "breakthrough" means a big important change.

Wrong options:

• breakthroug: It leaves out the "h". Write "breakthrough". Only the exact spelling gets the mark.
• break through: This is two words, not the single word used here.

Correct answer: revolution

Explanation: Listen again to "rapid revolution in technological". You need a word for a big change, it ends in ion.

Meaning: "revolution" means a very large and fast change.

Wrong options:

• revolutoin: Two letters are in the wrong order. The right spelling is "revolution". Every letter must be correct to get the mark.
• evolution: This means slow change over time, not a fast major change.

Correct answer: emergence

Explanation: Here you hear "witnessed the emergence of steam". It comes after "the", so you need a word for something coming into use.

Meaning: "emergence" means the coming into view or use.

Wrong options:

• emergance: It has "a" where the word has "e". Check the letters: "emergence". A small spelling mistake loses the mark.
• emersion: This is a different word and not the idea of something starting to appear.

Correct answer: expansion

Explanation: The speaker says "substantial expansion in the demand". You need a word for an increase, so check the sion ending.

Meaning: "expansion" means an increase or growth.

Wrong options:

• expantion: It has "t" where the word has "s". The right spelling is "expansion". Every letter must be correct to get the mark.
• extension: This means stretching out, not the idea of growing or increasing demand.

Correct answer: contributed

Explanation: You hear "eventually contributed to labor movements". This already happened, so the word ends in ed.

Meaning: "contributed" means helped cause or lead to something.

Wrong options:

• contributd: It leaves out the "e". Write "contributed". Only the exact spelling gets the mark.
• contribute: "contribute" is missing the ending. The speaker says "contributed", with "d" at the end.