The scientists claimed( 声称) to _______ a jet plane that uses atomic energy as propelling _____, but they can’t produce an atom of evidence to prove it. [ ]

The reporters have found out ____ itwas _____ saved the little girl.

It is believed to _____ over by sandstorms from AD 200 to AD 400.

The soldiers did what they did to rescue the survivors _______the danger of aftershock

Do you know a spaceship flies at about nineteen kilometers ________ second