Humans are polluting the earth day by day, ________, of course, will cause punishment sooner or later.
He is always ready to help others. That’s one of his _____.
Please remind me in case I ______ forget.
The bridge ____ in the 1800’s was the oldest building in this village.
It was playing computer games that cost the boy plenty of time that he ______ spent doing his lessons.
Sarah hopes to become a friend of __________shares her interests.