1. a/an/the
A. There's "u" and _____ "s" in _____ word "us".
B. There is _____ young man and _____ old man in the photo. ______ old man is _____ young man's father.
2. one/ones
A. I don't like this skirt. Show me that _____.
B. The new skirts are mine. The old _____ are yours.
3. by/with/in/use
A. Jay can sing the song _____ either Chinese or English. How great!
B. I won't believe it until I see it _____ my own eyes.
C. We usually ______ a ruler to draw a straight line.
