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Experiments in the photography of movingobjects ( )in both the United Statesand Europe well before 1900.
have been conducting had been conducted were conducting being conducted
From the standpoint of the long termstrategic interest of the West it is imperative that( )
their territorial unity be a safeguard
their unity is a territorial safeguard
ther’re a territorial safeguard
their territorial unity being a safeguard
Astronauts can be affected by lonelinessfor they have to sit in the spacecraft for weeks with very little( )and no one( )
to do to talk
doing to talk to
to do to talk to
doing to talk
The elimination of inflation would ensurethat the amount of money used in repaying a loan would have ( )as the amount of money.
as the same value
value as the same
the same value
the value is the same
Our ( )talks promise a good future for our cooperation.
Interior insurance initial invisible