A thief broke into our house last night while my ...

★ Simple Past or Past Continuous

A thief broke into our house last night while my sister and I _____ (pick up) a pizza for dinner.

A. were picking up

B. picked up

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While Kate ___________(drink) some milk, she ___________(drop) the glass.

A. drank, was dropping

B. was drinking, dropped

C. drank, were dropping

D. were drinking, dropped