______ will the fog and haze last—I’ve no idea. There is no sign of an end.

The reason he did not come was he was ill

Do you know the reason _________ pilotsturn off the plane’s lights before taking off —The practice is for the passengers toadjust to the dark _________ an emergency

Take care! Accidents _________ happen along this part of the road.

The students were participating an international energy saving competition between towns in New England and Canada.[ ]