It was not until midnight ______ they reached the camp site.
The problem just________to be discussed at the class meeting tomorrow.
Your mother _______, however, say that to us that day.
Kate’s little brother kicked the ball to the river; she took great trouble to get in _______the river.
My brother was still studying _______into the night while I was _______asleep.
It was she that ________a sharp whistle, which makes ________possible for us to catch the thief.