1.First, he ... the message. Then, he ... his boss to inform him about the accident. a) read / called b) was reading / called c) read / was calling
d) was reading / was calling

2. John looked tired this morning. He ... all night long.
a) had been studying b) had studied c) was studying d) studied

3. Her mother ... the window when it ... to rain.
a) cleaned / started b) had been cleaning / started c) were cleaning / started
d) cleaned / were starting