It is no use _________ to persuade him ________ smoking because he has been addicted to it since he wasyoung.
---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.
________fit, we ought to learn more about our body and be careful with what we eat.
Mike must be angry with me, for he walked________me without even saying hello.