一、选词(组)填空。
1. — (How/How old) are you? —Nine.
2. —How old (is/are) your sister, David? —She is four.
3. —How old (am/are) they? —They're both ten years old.
4. —How old is the baby? —It's one (year/years) old.

1. How old
2. is
3. are
4. year

二、看图,并根据上下文写出答句或问句。
1. —How old are you, Xiaoli?
—
2. —
—He's seven.
3. —How old is Huahua?
—
4. —
—He's five.

1. I'm nine.
2. How old is Chenchen?
3. She's six.
4. How old is Xiaoyang?