If you are not familiar ____ the topic, you may write something that is familiar ____ you.
I am always delighted when I receive an e-mail from you. the party on July 1st, I shall be pleased to attend.
There are some health problems that, when in time, can become bigger ones later on.
Bears fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
Half of surveyed in 16 countries say they go first to their closet friend to share their deepest wishes and darkest fears.
Nothing could be done, he_____ absent.