We must take steps to prevent the __________ world population.
—How about putting some pictures into the report? —_______ ? A picture is worth a thousand words.
—Alice, feed the bird today, _____? —But I fed it yesterday.
The mother didn’t go out to search for her lost son. I wonder ______________________him.
Look! The dictionary , _____is red , is a birthday gift given by Father.
_________ we can’t understand is ___________ he didn’t join us in our discussion.