— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
——Can you tell me why________? ——Because I want to help the people there.
They went to the park yesterday, ________?
She________ know the answer, but I'm not sure.
Chinese________ by the largest number of people.
Now China has joined WTO(世贸组织), so I think English is________ useful than before.