Which Central European country lost its coastline after World War I and is now landlocked?

To which country does Socotra belong? Which of these South American countries is landlocked? Besides Bolivia, which is the other landlocked country in South America? Which of these European countries is landlocked? Which of these Central Asian countries is doubly landlocked? Which European microstate is doubly landlocked? Which Himalayan country is landlocked between China and India? Which of these East African countries is landlocked?