Modern forms of transportation and communication have done much to ______ the isolation（隔离）of life in Alaska.
| A．break down | B．break out |
| C．break into | D．break through |
Sarah, hurry up. I’m afraid you won’t have time to ________ before the party.
| A．get changed | B．get change | C．get changing | D．get to change |
— How can I wake up so early?
— Set the alarm at 5:00 am. ________ you will make it.
| A．and | B．but | C．or | D．so |
— Has Sam finished his homework today?
— I have no idea. He ________ it this morning.
| A．did | B．was doing | C．has done | D．had done |
You can come here to ask me ________ if you have any questions.
| A．at one time | B．at a time | C．at any time | D．all the time |
________ is no possibility ________ she can finish the task in two hours.
| A．There; that | B．It; that | C．There; whether | D．It; whether |