American Indians _________ about five percent of the U.S. Population.
On the graduation day, he received from his father a nice present ______ a note was attached, saying “I’m proud of you.”
We should do what we can to save those _____ species, including the tiger, an animal which was considered _____ to humans.
—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.A. can; must B. 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 survey has found that many medical workers would not choose the profession __________ a second chance, citing high stress and tense patient-doctor relationships.