While I was in the Disneyland，I saw some children________in the roller coaster，laughing happily．
| A．sit |
| B．sat |
| C．to sit |
| D．sitting |
What do you usually use your computer _________ ?
| A．in | B．with | C．for | D．to |
Would you mind ___________ me how to start this online tour ?
| A．show | B．to show | C．showed | D．showing |
Mr Wang isn’t here , I think he __________ Shanghai .
| A．went | B．went to |
| C．has gone to | D．has been to |
--- Lily is ill in hospital .---Really ? I _____ know she was ill .
| A．don’t know | B．know | C．knew | D．didn’t know |
The task is so hard for
e . I don’t know _______________.
| A．what I can do | B．how to do | C．what to do | D．both A and C |