Meaning: "atoms" means very small parts that make up matter.

Wrong options:

• atomes: It adds an extra "e". The right spelling is "atoms". Every letter must be correct to get the mark.
• atom: "atom" has no "s" at the end. The speaker says "atoms", so write the "s".

Correct answer: electrical

Explanation: Listen for "control electrical charges". It comes before "charges", so you need a describing word.

Meaning: "electrical" means about electricity.

Wrong options:

• electical: It leaves out the "r". The right spelling is "electrical". Every letter must be correct to get the mark.
• electric: "electric" is missing the ending. The speaker says "electrical", with "al" at the end.

Correct answer: rockets

Explanation: On the recording you hear "using rockets". It follows "using", so you need more than one. Do not forget the s.

Meaning: "rockets" means flying devices used to make lightning go where you want.

Wrong options:

• rokets: It leaves out the "c". The right spelling is "rockets". Every letter must be correct to get the mark.
• rocket: "rocket" has no "s" at the end. The speaker says "rockets", so write the "s".

Correct answer: aimed

Explanation: Listen again to "are aimed firstly at mirrors". It comes after "are", so the word ends in ed.

Meaning: "aimed" means pointed or directed at something.

Wrong options:

• aimmed: It adds an extra "m". Write "aimed". Only the exact spelling gets the mark.
• aim: The sentence needs the form that ends in ed, not the base word.