Alexander Graham Bell ____________________ the telephone.

Did you read the contract? Yes, I ____________ it back to the legal department.

He _______________- on the report when the conference started.

Susan ____________ three "A" levels before she went to Lancaster university.

We all _________________ a vacation time before we started the semester.

We ___________________ a lot of problems with the connectivity while we were sharing screen.

We  ___________________ face to face classes before the pandemic started.

It took us 20 minutes to realise that we ______________________ in the wrong way.

Two labs ____________________- the vaccine for two months before  it came onto market.