Since then, my aunt many homeless children.
Scientists are working hard to make _______ possible for people to live on Mars in the future.
After you see the pictures, you will realize ______ danger the wildlife faces.
--- Middle school students hardly know anything about shopping online, ____ they? --- ________. It’s very popular with teenagers.
In the UK, a woman usually doesn’t like to be asked _________.
--- Look! That teacher is explaining something to her students again and again. --- _________ teacher she is.