"Tied up' or 'Occupied': which of them is correct? Is it possible to say 'I'm tied up all day' and 'I'm occupied all day' with the meaning 'I'm busy'?

'To give a ring ' = 'to give a call' or not? Is it correct to say 'to give a ring' with the meaning 'to give a call'?

Using the verb 'to copy' Is it possible to use the verb 'to copy' (with an adverb or two adverbs) in order to say the same: - to send somebody a copy of an e-mail?

'Hear you' or 'Hear from you' What is the difference between 'Hear you' and 'Hear from you' (i.e. I am glad to hear you / I am glad to hear from you)? Which of these forms is more correct, or both of them are possible?

Thanking you in anticipation: use in the context I have some doubts about using the expression 'thanking you in anticipation' in letters. For instance, is it possible to say in the end of the letter: Thanking you in anticipation, John? Should I use this expression instead of 'Best regards' ('Best wishes' etc.), or before that?