1.Don't ride a motor-bike on the road,Ben.（现在进行时态）
问题描述：
1.Don't ride a motor-bike on the road,Ben.（现在进行时态）
2.Grandpa is reading a book in the dining-room.（划线提问）
划线部分是a book
答
1.Don't ride a motor-bike on the road,Ben.（现在进行时态）
isn't riding a motor-bike on the road,Ben.
2.Grandpa is reading a book in the dining-room.（划线提问）
what is grandpa reading in the dining-room?