Michael Jordan is a man who never gives up in his life. And that's _________ he succeeds.
If you have headaches often, you need _______ .
He wasn’t _____ to understand the questions.
The strong young man can swim ______ the river.
The boss(老板) makes the workers _____ these machines(机器) for ten hours a day.
—Kangkang, will you _____ your photos _____me tomorrow? —OK.