Week2-2; What was it doing ?

Past simple versus past continuous

http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise1.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise2.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise4.html
http://www.englishgrammarsecrets.com/pastsimpleorcontinuous/exercise6.html
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07