—You won’t believe it, Sam. I was chosen as an exchange student to China. —Congratulations! ____________ .
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.
69.I like ____ in the autumn when the weather is clear and bright.