He was faced with the of whether or not to return to his country after he got the doctor's degree in America.
You needn’t write on __________ line. You can write on __________ line.
You __________ to leave until you __________ your work.
We have every reason to believe that __________ 2016 Olympic Games will be __________ success.
—Bob, how about having a picnic this weekend?—________ I'll check my schedule.
If you _________ my advice, you ________ your failure now. You _________ your victory.