--Aren’t we living a happy life? --You should not be content with what you have. _______, you must be better in every aspect of your life.
Doctors Without Boarders, ________ international organization, received ________ Nobel Prize for Peace in 1999 for its outstanding work .
It was several minutes ________ we realized what was happening—our dog was trapped in a newly-dug tunnel.
Luckily, I ________ before the deal turned bad, which saved me much money.
When you hear a fire alarm, don't rush________, you should keep calm.
No matter where he is, he makes ________ a rule to go out for a walk before breakfast.