Ⅹ. Look and complete the following sentences. 看图，完成下列句子。
Model: — What is she doing?
— She is playing tennis.
1. — What is ______ ______?
— He is ______ a horse.

2. — ______ are ______ ______?
— They are ______ ping - pong.

3. — ______ is ______ ______?
— He is ______ ______.

4. — ______ ______ they ______?
— They ______ ______.

1. — What is **he doing**?
— He is **riding** a horse.
2. — **What** are **they doing**?
— They are **playing** ping - pong.
3. — **What** is **he doing**?
— He is playing football.
4. — **What are** they **doing**?
— They **are running**.