It is no use _________ to persuade him ________ smoking because he has been addicted to it since he wasyoung.
How_________I help them to understand when they won’t listen to me?
The film is very humorous but_________can be enjoyed unless you understand English culture.
—Your composition is full of mistakes. —I wish I _________more careful.
._________life began on the earth is one of the biggest puzzles to scientists.
.—Let’s throw a surprise party for mom’s 50th birthday.—That’s a good idea. We_________several of her friends.