It is none of your business ______ other people think about you. Believe in yourself.
______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.
In middle schools all over China, boys_____not to wear their hair long.