Nowadays，scientists are working hard to find a best way of treating addictions ________ drugs.

They argued________the waiter________the price of the meal in the restaurant.

The time that she devotes ________ the comic stories is so much that she can’t spare any time to look after her baby.

It was __________ I had to prepare for my exam that I didn't go to see the film Just Call Me Nobody (大笑江湖).

—Are you free after school?
—Sorry. I’ve planned to treat a friend of mine to dinner ________for his help.

____ the 1990s, the number of antelopes had fallen to about 50,000.

--- Not everything that is best for nature is good for people.
--- Yes, would anyone say that economic development should be stopped ______ nature?

—The price is fine with me. How would you like it to be paid?
—Just ______ cash, please.

—I really think he is an excellent actor.
—I agree with you _______.

Rose was wild with joy         the result of the examination.