The students _____________________ (not sit) at their desks when the teacher came in the classroom

At seven o'clock yesterday, I __________________ (not watch) a football game with my friends.

Was it snowing when you ____________ (wake up) this morning?

People _________________ (not use) computers one hundred years ago.

Mary met Simon while she ___________________ (travel) around Europe.

We _________(not buy) any souvenirs while we were in Crete.

They fell asleep while they ______________________ (read) a book.

The girls ________________ (dance) while their teacher was playing the piano.

David _____________________ his teeth at that moment.

• brushed

• was brushing

The players ______________ the court three minutes ago.

• entered

• were entering