_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
62. Everyone who comes to the party is given a wooden apple with _____ own names cut in it as a souvenir.
| A．his | B．her | C．their | D．our |
63. Children can usually dress ______ by the age of five.
| A．him | B．them | C．himself | D．themselves |
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 |