__ gas leaks and similar accidentsshould occur, some responsible persons should regularly inspect all thelaboratories

trol in the car ____ on our way to the beach, sowe had to walk there

Mary’s got mad and has been sent to the mental hospital. Did you tell her boss about that?— Yes, but I _____ her husband first.

Great changes have taken place sincethen in the primary school _______I am studying.

My parents ___________ the airport this morning.