Can someone help its ser vs estar

Es necesario que las autoridades nos medidas para proteger el medio ambiente. a. sugiera b. sugieran c. sugieras d. sugeremos

(i put) la carta dentro de uno de estos.

59: 33 according to the article, which of the following is not one of the reasons flamenco is special? a. it is not popular in the west, but it is a western form of music. c. the dance also serves as an instrument. b. the music, song, and dance can all be improvised. d. it is folk music of high quality and complexity.