_______ you call me to say you are not coming, I’ll see you at the theatre．
| A．Until | B．If | C．As | D．Unless |
We should do what we can to save those _____ species, including the tiger, an animal which was considered _____ to humans.
| A．dangerous; endangered | B．dangerous; in danger |
| C．endangered; in danger | D．endangered; dangerous |
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
A. can; mustB. can; may
. must; can D. may; must
I am not fond of ______ music very much, but I do like ______ music they are dancing to.
| A．不填; 不填 | B．the; the |
| C．the; 不填 | D．不填; the |
A survey has found that many medical workers would not choose the profession __________ a second chance, citing high stress and tense patient-doctor relationships.
| A．they were given | B．they will give |
| C．they should give | D．should they be given |
— Was it 11 o'clock your father came back last night?
—Yes, he is always coming back so late.
| A．that | B．while |
| C．when | D．until |