几道英语句型转换,1、Mike didn't see anybody enter the building before

几道英语句型转换,
1、Mike didn't see anybody enter the building before ten.(改为同义句)
Nobody ______ ______ _______ _______ the building before ten.
2、Look at the boy.He is riding a blue bicycle.(合并为一句)
Look at the boy ______ _______ ________ ________.
3、Look at the boy ,He is wearing a hat .（合并为一句）
Look at the boy ______ ______ ______.