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the train____half an hour ago

• has been leaving

• Left

• has left

• had left

after they ____ their work, they watched TV

• finish

• have finished

• Had finished

• will finish

3. bill(have)___breakfast when I stopped at this house this moring (was having)

3. when we went back to the bookstore, the bookseller ____the book we wanted

• sold

• Had sold

• sells

• 
  has sold

as we(cross)___the Street, we săm ac adcident(were cossing)

Tom saw a serious accident while he(stand)___at the bus stop(was standing)

the children(play)____ football when their mother came back home(was playing)

the bell(ring)___while Tom was talking a bath(rang)

he (sit) ____ in car when I (see) ___ him(was sitting/was)

we (clean) ___ the hours when she came yesteday (were cleaning)