We have planted thousands of trees in recent years. This year _____ we’ve planted ten thousand trees.

It was ____ loud music that we couldn’t hear ourselves speak.

After two years’ research, we now have a __________ better understanding of the disease. 

One day, when I was walking in the street, someone dropped a pie from a window above, and it _______ missed landing on my head.

The earth could be younger and took more than three times longer to form than _______ thought, according to a new study.