—Did you know more about the mine accident?—Oh, sorry, I had no idea. I ____the Rescue Center now.
While reading, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.
I don’t know how it ___________ that our car was bumped from behind.
Nowadays, an increasing number of people have ___________ to the information they need through the Internet.
The development of industry has been ________ gradual process throughout ______ human existence from stone tools to modern technology.
----I’m afraid I’ve broken your cup. ----______________, it was old and I was going to throw it away.