The police ________ him to see if he had a gun.
. The house caught ______ fire while they were away. It must have been set ______ on fire by someone.
. _______ the argument sounds reasonable, it still needs support of evidence.
. .Modern China is experiencing a completely new period ______ respect for science and creativity has become the guiding principle of the society.
. Britain, ______ many other industrialized countries, ______ major changes over the last 100 years.
. As the newspaper reported, the talks were held in an open, friendly, cooperative and constructive ______.