Раскройте скобки, употребляя глагол в нужном времени (Past, Present, Future simple)

Question

Раскройте скобки, употребляя глагол в нужном времени (Past, Present, Future simple)

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Answer 1

1 - are covered,
2-were built
3-was bought
4-was bitten
5-was built
6-will be taken
7-is elected
8-was invented
9-is cleaned
10-will be studied