Samuel Clemens,______ Mark Twain, wrote many popular stories.
I’ll give the prize to _______ finishes the work first.
In the 16-19 age group,32 of women smoke ______ 28 of men.
How pleasant the picture is to _______!
-What did you think of ______ president?-I didn’t care for him at first,but after ____ time I get to like him.
Last term our maths teacher set so difficult an examination problem _____ none of us worked out.