.—She must have gone back to the valley. —No, she_________. The entrance to it was nowhere to be found.
The villagers went out to the mountain __________ the missing child.
It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.
When the question _____ at the meeting, no one could answer it.
---- What about going swimming this afternoon , Tom?---- ____. I have a test tomorrow, so I have to go over my lessons today.
—Tom has failed again in the math exam. I am really let down. —_____.