1Why (he / refuse / use) social media? Everyone is on Facebook except him! 2Giulia (miss / meet) her friend, Stefano, at the café near their secondary school. They've lost contact with each other.
3Maria usually (spend / lot / time / talk) on the phone.
4Felix and Eva (avoid / talk) politics – they prefer discussing other topics.
5 (you / mind / open) the window for a while? It's really hot in here.
6My sister (not / stand / clean / window). She says it's dead boring.

1. Why does he refuse to use social media? It seems like everyone is on Facebook except for him!

Explanation: The sentence is in the present simple tense, so we need to use the auxiliary verb "does" and the base form of the main verb "refuse". The reason for his refusal is stated in the second part of the sentence - "Everyone is on Facebook except him!"

2. Why did Giulia miss meeting her friend Stefano at the café near their secondary school? They've lost contact with each other.

Explanation: The sentence is in the past simple tense, so we need to use the auxiliary verb "did" and the base form of the main verb "miss". The reason for missing the meeting is stated in the second part of the sentence - "They've lost contact with each other."

3. Why does Maria usually spend a lot of time talking on the phone?

Explanation: The sentence is in the present simple tense, so we just need to use the base form of the main verb "spend". The reason for her spending a lot of time talking on the phone is not mentioned in the question.

4. Why do Felix and Eva avoid talking about politics? They prefer discussing other topics.

Explanation: The sentence is in the present simple tense, so we need to use the base form of the main verb "avoid". The reason for their avoidance is stated in the second part of the sentence - "They prefer discussing other topics."

5. Would you mind opening the window for a while? It's really hot in here.

Explanation: The sentence is in the present simple tense, so we need to use the base form of the main verb "mind". The speaker is asking if the person would be willing to open the window, as it is hot in the room.

6. Why doesn't my sister stand cleaning the window? She says it's dead boring.

Explanation: The sentence is in the present simple tense, so we need to use the auxiliary verb "does" and the base form of the main verb "stand". The reason for her dislike is stated in the second part of the sentence - "She says it's dead boring."