----- Do you know when Tonny came back last night? ----- Yes. It was not yet nine o’clock _____ he came back home.

____, a form must be filled in.

_____ is no doubt _____ John’s knowledge of first aid saved Ms Slade’s life.

--- Do you know our town well?--- No, this is the first time I _______ here.

There is clear evidence _____ smoking does harm to our health.