A person who likes to others is definitely not easy to get along with.
You may catch up with others __________ you work a little harder.
Without electricity human life __________ quite different today.
Gunpowder is generally believed __________ in ancient China.
It was __________ great shock to the world that a French airplane got missing over __________ Atlantic Ocean on June 1st, 2009.
I feel nervous before the exam. -- __________. It won’t be too difficult for you to pass.