President Obama told television viewers that he saw ______ as his duty to run for a second term.
| A．one | B．that | C．this | D．it |
35．You have broken your promise；you______painting the house long ago．
| A．could have finished | B．had better finish |
| C．must have finished | D．should have finished |
34．Wow! Look at the man and his horse ________are running down the road.
A．which B．that C．who D where
33．A cool rain was falling_________with snow causing heavy traffic．
A．mixed B mixing C．to mix D．having mixed
32．Hesitating what to do，________．
| A．so let’s not go outing | B．the tour was cancelled |
| C．but we should still take the tour | D．we had to stay home |
31．The man stopped his bicycle beside the car______it had a broken chain．
| A．or | B．until | C．as | D．Yet |