Question

1. As soosn as Alice ... home she phoned her friend.

came
was coming
had come
had been coming

3. While Tom ... in the sea he saw a shark.
swam
swim
had swum
was swimming

After I got out of the bus I realised that I ... my umbrella there.
had left
was leaving
left
had been leaving

5. German scientists ... covid-19 DNA for two years when they finnally foud out the weakest point in its structure.
researching
were researching
had researched
had been researching

6. Last Sunday Josh ... his friends and they went to the skatepark.
meet
met
was meeting
had met

7. When mum came into the room Helen ... playing the piano.
stopped
stoped
was stopping
had stoped

8. Mrs Adams ... for 30 years when she was fired.
was working
had been working
had worked
worked

9. Mandy was tiding her room while her brother ....
had been washing up
washed up
had washed up
was washing up

10. Sam really ... himself when he was a teenager.
enjoyed
was enjoying
enjoying
had enjoyed

Answer 1

1came, 2was swimming, 3had left, 5had been researching, 6met, 7stopped, 8had been working, 9was washing up, 10was enjoying