Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ______.

The boy slipped out of the room and headed for the swimming pool without his parents’ _____.

That she hadn’t kept her ____ on her work resulted in the failure.

I can remember very few ______ when he had to cancel his plans because of poor health.

Xiao Wang suggested a way to solve the _________.