Two years ago, three scientists traveled to the Antarctica to explore a secret world hidden _________ the ice.
I want to buy Mother something ______ for her birthday, but I don’t know what she likes best.
______ their house in London, they also have a villa in Spain.
–I’m losing my eyesight, I’m afraid. --To finish this book, you ______ in front of your computer too long.
How can you expect to make progress ______ you never listen in class?
Fans crowded the street outside, ______ a look at their hero.