—Why are the lights in the teachers’ office still on?
—There ________ be some teachers working there.
| A．can | B．must | C．may | D．ought to |
–Have you finished your homework _______? – No, I haven’t finished it ________.
| A．till; yet | B．yet; already |
| C．yet; yet | D．already; already |
---I’m leaving for Canada tomorrow. My plane leaves at 6:00 tomorrow morning.
---_________
| A．How wonderful! | B．Really? |
| C．Have a good trip! | D．Well, goodbye. |
--- Have you finished your homework ___________?
--- Yes, I have done that ____________.
| A．yet; already | B．already; yet |
| C．ever; never | D．still; just |
---_________ did your cousin leave his hometown?
---He _________ for nearly five years.
| A．When; has left | B．When; has been away |
| C．How long; has left | D．How long; has been away |
Mrs. Black isn’t used to _________ by sea and she used to _________ sick a lot.
| A．traveling; feel | B．travel; feeling |
| C．travel; feel | D．traveling; feeling |