The students were ____ over the ____ problem, listening to the teacher with a ____
expression on their faces.
| A．puzzled; puzzling; puzzling | B．puzzled; puzzling; puzzled |
| C．puzzling; puzzling; puzzled | D．puzzling; puzzled; puzzling |
My sister often needs help with her study, ?
| A．need she | B．needn’t she | C．doesn’t she | D．does she |
He isn’t a diligent boy, for it is the second time he has been late, ?
| A．isn’t it | B．is he | C．has he | D．is it |
A lovely day, ?
| A．is it | B．does it | C．isn’t it | D．doesn’t it |
Everything is right here, ?
| A．isn’t it | B．aren’t they | C．are they | D．is it |
None of the workers attended the party, ?
| A．did they | B．did he | C．didn’t he | D．didn’t they |