___ from a plane, the Great Wall looks like a huge dragon.
| A．Seeing | B．Seen | C．To see | D．Look out |
64.There is a photo on the wall.____ the photo of Lei Feng.
| A．It | B．Its | C．It's | D．He |
65.Is＿necessary to tell his father everything?
| A．it | B．that | C．what | D．He |
66. Is＿possible to fly to the moon in a spaceship?
| A．now | B．man | C．that | D．it |
67.I consider____ my duty to help you．
| A．it | B．this | C．that | D．its |
68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
| A．while | B．that | C．when | D．As |