_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable.
_____the soap operas, she got down to finishing her homework.
I’m afraid Mr. Harding ______see you now. He’s busy.
The old man has four sons, and two _____ turned doctors.
—Thank goodness, you are here! What _____ you? —Traffic jam..
_____with so much trouble, we failed to complete the task on time.