I think it’s really _________ hard work for me to finish the job in twenty minutes.

Tony is said________ to New York，and now he is studying medicine in a famous college in America

decided to compete in the race, but I’m afraid I won’t be the best.－____. You never know until you try.

b is not very rewarding _______ money, but he is getting valuable experience from it.

_______ you’ve got a chance, you might as well make full use of it.