With everyone's face ________behind the mask,it's hard to tell who they really are.
---- Did you ______ the concert yesterday evening? ---- Sorry, I didn’t have enough time.I really regret ______ my homework earlier.
On the top the mountain, you can get a wonderful ______ of the nearby hills.This is the very reason _______we like to go there in our spare time.
To live in ______ countryside for some time is really ______ helpful experience to children growing up in the cities.
Dad, about how long will it be before I die? You aren’t going to die. ________?
Idioms are an important part of language, and are used in _______ from literature to films and newspapers.