Нужно поставить : In ,on, for, to 1) the head of

Необходимо поставить : In ,on, for, to 1) the head of the government was .... a visit ... Italy some days ago. 2) My friend has been to France ... September. 3) Petrov has already left Kiev ... Yalta. 4) The delegation has just arrived ... London. 5) He stays ... Volkovo every summer. 6) Some representatives of African countries paid a visit ... the President of our coutry.