The number of the employees has grown from 1,000 to 1,200. This means it has risen ____20 percent.
64.There is a photo on the wall.____ the photo of Lei Feng.
65.Is_necessary to tell his father everything?
66. Is_possible to fly to the moon in a spaceship?
67.I consider____ my duty to help you.
68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.