It was not until dark ______ he found ______ he thought was the correct way to solve the problem.
--Why doesn’t Sam come here with you?--I’m sorry, but he _______ from ill health at the moment.
As teenagers of the 21st century, we should be ready to _____ the challenge of society.
It is the third time that he ______ the first prize in the competition.
We have not fallen in love ____ each other, but only get ____ well with each other. Don’t be surprised.
She always come to our help when we get into trouble ____ she is very busy.