was & were 前世今生

It ​ (a)   a kitten.
Now it ​ (b)   ​ a cat.

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It ​ (a)   a puppy.
Now it ​ (b)   ​ a dog.

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They​ (a)   cubs.
Now they​ (b)   bears.

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It ​ (a)   a seed.
Now it ​ (b)   ​ a sunflower.

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They​ (a)   eggs.
Now they​ (b)   ​chicks.

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It ​ (a)   milk.
Now it ​ (b)   ​ cheese.

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They​ _____ seeds.
Now, they are watermelons.

I _____ a student.
Now, I am a teacher.

She was in Japan.
Now, she _____ in Taiwan.

We _____ in Taiwan.
Now, we are in Russia.