The great _______ of my plan is that it’s so cheap compared to the others.

I saw the Smiths at West Beijing Station this afternoon.— You __________. They are still on holiday in Hawaii.

The old lady didn’t know whenthe house caught fire.

Looking at old photographs of yourself on social websites can improve your mood, and this finding _______ previous researches, which suggested otherwise.

I would have come earlier, but I________that you were waiting for me.[ ]