Tom began to learn Russian by himself in _____.
| A．the fifty | B．the fifties |
| C．his fifties | D．his fifty |
When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.
| A．were hanging |
| B．had hung |
| C．hung |
| D．would hang |
The way the guests ___ in the hotel influenced their evaluation of the service.
| A．treated |
| B．were treated |
| C．would treat |
| D．would be treated |
Scientists have many theories about how the universe ___ into being.
| A．came | B．was coming |
| C．had come | D．would come |
She'll never forget her stay thereshe found her son who had gone missing two years before.
| A． | that | B． | which | C． | where | D． | when |
My uncle’s house in the downtown area is much smaller than ours , but it is twice _______ expensive . 
| A．as | B．so | C．too | D．very |