Put the verbs in the correct passive tense

The Moscow Kremlin

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1. The word 'kremlin'
   [ ][ ]
   to describe a Russian castle or fortress. The Moscow Kremlin is the best known Kremlin of all.
2. The wall around the Moscow Kremlin dates back to 1156, and at first it
   [ ][ ]
   of wood.
3. Since then, it
   [ ][ ][ ]
   with stones.
4. The Kremlin
   [ ][ ][ ]
   as the centre of Russian government until 1712.
5. Four palaces and four cathedrals are some of the structures that can
   [ ][ ]
   at the Kremlin.
6. In 1990, the Moscow Kremlin
   [ ][ ]
   a World Heritage Site.
7. It
   [ ][ ]
   that over a million people visit the Kremlin every year and it
   [ ][ ][ ]
   by many more tourists in the future.