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B
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100

I ________ (sleep) when you called.

I was sleeping when you called.

100
They were talking when someone _______(knock) on the door.
They were talking when someone knocked on the door.
100
Brian looked like he _________(do) well when I _______(visit) him in the hospital.
Brian looked like he was doing well when I visited him in the hospital.
100

I ___________ (attend) a lecture yesterday at 2:30 when the bus _______ (break) down. 

I was attending a lecture yesterday at 2:30 when the bus broke down. 

100

She ___________ (drive) home when she _____ (hear) the news.

She was driving home when she heard the news.

200

They __________(eat) last night when they _____(hear) the baby cry.

They were eating last night when they heard the baby cry.

200

I was planting flowers when I ______(hear) a girl scream. 

I was planting flowers when I heard a girl scream. 

200
I _________(eat) a bowl of cereal when a bug____(fly) into my bowl.
I was eating a bowl of cereal when a bug flew into my bowl.
200

Jack _________(study) while Dan _________(cook) dinner.

Jack studied while Dan was cooking dinner.

200
We ____________(have) breakfast when the dog _______(jump) on the table.
We were having breakfast when the dog jumped on the table.
300
It was raining hard when we ______ (leave) the building.
It was raining hard when we left the building.
300
He ________(run) when he ____ (see) a car accident.
He was running when he saw a car accident.
300

While my mom __________(sleep), I __________(play) video games.

While my mom was sleeping, I played video games.

300

My grandparents ____________(stay) at my house while I ___________(travel) around Italy.

My grandparents stayed at my house while I was traveling around Italy. 

400

He_______ (listen) to the radio when he_____ (hear) the bad news. 

He was listening to the radio when he heard the bad news.

400

The boy______(steal) the chocolate from the Christmas tree while his parents _____(sleep).

The boy stole the chocolate from the Christmas tree while his parents were sleeping.

400

The students ________ (argue) when Mr. Mike_____(ask) a question. 

The students were arguing when Mr. Mike asked a question. 

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