Harry Potter fans were left in shock ___author J．K-Rowling revealed she regretted pairing Granger and Ron in the novel．

You should wear a shirt with long sleeves _________ you get burnt in the sun.

______ I always felt I would pass the exam, I never thought I would get an A.
A. While      B. Once       C. If       D. Until    

______________ we wear, our family and friends may accept us, but the workplace may not.

_______ you get on well with a number of people, you are usually friends with only a few.

_____there are many different types of food, some animals spend their lives eating only one type.

Could I speak to ____ is in charge of International Sales, please?

—Are you guys ready for “The Campus Singers Competition”?
—Sure！Since we are young, try it, _____ we will regret!

You can complain, but I doubt _____ it’ll make any difference．

How can school ban mobile phones completely __________ some of the parents simply don’t follow the rule?