Complete the sentences with the correct forms of the verbs.

Choose the correct option.

I [were cooking|was cooking|was cook] dinner at 6 o'clock yesterday.

She [were studying|were study|was studying] for her exam all night.

They [were playing|was playing|was play] basketball in the park when it started to rain.

The baby [were cry|was crying|were crying] loudly in the middle of the night.