______ frightened us ______ a tiger turnedup suddenly in front of us.

Sam said sorry to his mother , so she_________.

I don’t like her face; _____ she smokes, which is something I hate [ ]

_______,when Marx was already _______,he found it was important to study the situation in Russia, so he began to learn Russian.

I watched everyone hurrying to and fro, most with eyes ____ the ground.