Attracting _____ senior citizens, Florida is _____ home to the largest population of elder Americans.
| A．不填; 不填 | B．the; the | C．the; 不填 | D．不填; a |
When the policeman stopped us, we all looked questioningly at him, ________.
| A．nervously and puzzled | B．nervous and puzzling |
| C．nervous and puzzled | D．nervously and puzzling |
Tom, clean up the broken glass _________ someone walks on it.
| A．since | B．when | C．before | D．as |
For the past year, he ______ a flat with others and trying to save money to open his own business.
| A．has been sharing | B．was shared |
| C．had been sharing | D．is sharing |
Years later, he returned home, unexpectedly the old tree of his childhood__________.
| A．finding | B．to be found |
| C．found | D．having found |
Last Sunday I climbed to the top of the hill near my home, ______ I could see half of the city.
| A．that | B．where | C．which | D．there |