Read the case below and then answer questions

Under a documentary negotiation credit, the credit states:

[1] Commercial invoices in triplicate should be provided;

[2] Insurance covered by the seller;

[3] Transportation started from Ningbo, China to Hamburger, Germany not later than July 18^th, 2022.

[4] The transaction is subject to UCP600.

Please answer the following questions:

[1] Who is responsible to pay the insurance premium?

[2] What should be written on a commercial invoice to make it function.

[3] If the seller finds it is hard to make a complying presentation and wants to make amendment of the credit, what should he do? Please tell the main procedures.

[4] If the cover note is presented for negotiation, will the negotiating bank accept it or not? Give the reasons for your judgment.

[5] If it shows one carton short on the B/L, will the negotiating bank accept it or not? Give the reasons for your judgment.