Ответ: portraits, 6, portraits
Разбираемся:
A There are museums and art galleries in cities and towns.
B You can see mummies in The Pushkin Museum.
C In the Tretyakov Gallery you can find portraits.
D The museum Hermitage has 6 buildings.
E There are portraits of Russian tsars in the Hermitage.
Ответ: portraits, 6, portraits