The story is so ________ that we are all________ in it.

There is no doubt ______ international cooperation is key to ______ with cybercrime, as Vinton Cerf has said that the problem of cybercrime is _______ huge that it requires UN to form a special agency to act as an international referee or steward.

There is no denying the fact that as one grows older，one’s memory ______.[ ]

Yesterday I missed my feet on the stairsand had a bad fall Luckily it was nothing serious ___

When I meet something difficult, he always offers me useful information.