_______ you have seen the film for three times, you must know something about the hero.
| A．Although | B．Since |
| C．Unless | D．When |
Look! There are some________ on the floor.
| A．child | B．water | C．boxes | D．girl |
——Can you tell me why________?
——Because I want to help the people there.
| A．do you go to Tibet（西藏） | B．did you go to Tibet |
| C．are you going to Tibet | D．you are going to Tibet |
They went to the park yesterday, ________?
| A．don't they | B．didn't they |
| C．aren't they | D．can't they |
She________ know the answer, but I'm not sure.
| A．maybe | B．may be | C．may | D．must |
Chinese________ by the largest number of people.
| A．is speaking | B．speak |
| C．speaks | D．is spoken |