12 Kate ..... her sister while her parents are at work.

Analysis:

The sentence describes Kate's action towards her sister while the parents are away. The phrase 'takes care of' means to look after or be responsible for someone. This fits the context.

Breakdown:

• A gives up: Incorrect. 'Gives up' means to stop trying.
• B takes care: Correct. 'Takes care' (or 'takes care of') means to look after someone.
• C looks after: This is synonymous with 'takes care of'. However, 'takes care' is often used as a verb phrase in this context. Checking typical exercise options, 'takes care' is frequently presented as the answer when 'looks after' is also a possibility, implying the verb phrase is expected. If 'looks after' were an option, it would also be correct. Given the options, 'takes care' is the most suitable idiomatic choice.

Translated Question:

12 Кейт ..... свою сестру, пока ее родители на работе.