阅读短文，回答问题。
Mr Zhang is a PE teacher at a Primary School. His class is very interesting. His students like him
very much. There are twenty boys and twenty girls in his class.
There is a PE lesson on Tuesday afternoon. Look! The children are now in the playground. The
boys are playing football. Mr Zhang is helping them. What are the girls doing? Some are playing games.
Some are playing basketball.
1. What's Mr Zhang?
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2. Are there fifty students in the class?
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3. What day is it today?
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3. What are the students doing?
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3. Are all the girls playing basketball?
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