Вставьте правильную форму глагола в Past Progressive Tense
She (to write) a letter at 6 p.m last evening.
Her father (to go) to the art gallery when he (to meet) her mother.
At 8.20 yesterday morning my mother (to drive) me to the university.
They (to sit) at the café at that time.
She (to study) in the library when they suddenly called