Who can help me identify these stamps and their value? Thank you.

The first stamp is "Romanian Traditional Costume" issued by Romania on May 5th, 1973. The catalogue number of Scott stamps is A720, a full set of 6 stamps. You only have 10 Barney stamps, and 2 yuan RMB is probably worth RMB.

Second, Zaire (Congo (DRC)) 198 1 February 8, 2008 issued the "World Telecommunication Day" commemorative stamp. The catalogue number of Scott stamps is A 190, with a full set of 8 stamps. You only have Makouta stamps with a face value of 1, and 2 yuan RMB is probably worth RMB.

The third stamp is the commemorative stamp of "Pirate mission to mars" issued by Dominica on September 20th, 1976. Scott's stamp catalog number is A73, a full set of 8 stamps. You only have stamps with a face value of 0.5 cents, and 2 yuan RMB is worth about RMB.

The fourth and fifth stamps are commemorative stamps of ITU Plenipotentiary Conference issued by Zaire (Democratic Republic of Congo)1983 June 13. Scott's stamp catalog number is A20 1, and there are a full set of 8 stamps. You only have Makouta and Zaire stamps with face value of 1, which are worth about RMB in 2 yuan and RMB in 6 yuan respectively.