What can be held via the Internet?

1.

We use the present perfect with just to talk  about recent events. When we use the present perfect, it suggests some kind of connection between what happened in  the past and the present time. "Just" in an affirmative present perfect sentence shows that something happened recently with a  consequence for the present.Мы используем (Present Perfect (Simple)) Настоящее совершенное время когда, говорим о недавних событиях. Когда мы используем Настоящее совершенное время, это предполагает некоторую связь между тем, что произошло в и настоящем времени."Just" в утвердительном предложении Настоящего совершенного  времени показывает, что что-то произошло недавно с последствиями в настоящем времени.

2.

1) I have seen something funny.

Have I seen something funny?

2) They have arrived home.

Have they arrived home?

3) Sam has dived into the lake.

Has Sam dived into the lake?

4) We have driven past my friend's house.

Have we driven past my friend's house?

5) He has broken the world record again.

Has he broken the world record again?

3.

... because they have just won the competition because I've just bought flowers because it has just snowed. ... because I've just tidied it. ... because he has just got terrible news.

For me volunteering? Somehow it's difficult to answer this question... What pushes modern girls and boys to help others by providing any possible help?.. Because they do it unselfishly, just because someone will smile back or say a quiet "thank you." And that's pretty unusual in our hard, pragmatic time, when sensitivity, generosity is not "listed", because everything is measured in monetary terms. And you can often hear: "Volunteer? And how much you pay?". And knowing that a volunteer is a volunteer, doing some work for free and on their own initiative to help others, make round eyes. "For free?! So what are you? Crazy or what?! And why is it you need? It is possible to find a decent job...".
ответ не совсем верный но это все что я мог составить