—Mom, this is my friend, Bob. — ___________
The young men walked _______ the forest(森林) and came to a big river at last.
________ a warm, sunny day, Alice got tired of having nothing to do.
—Who helped you with your homework?— _______ . I did it myself.
—Do you like watching the NBA matches ?—No, but I _______ Yao Ming when I was a little boy.
—What is Mum cooking in the kitchen?—Fish, I guess. How nice it _______ !