—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
I failed in the final examination last term and only then_____ the importance of studies.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
It’s John’s birthday today. I wish I _____ her out to a superb restaurant for dinner, but I’m too busy recently.
| A．can take | B．take | C．could take | D．had taken |
__________ of time and energy has been spent in investigating the murder.
| A．A great deal | B．A good many | C．Large numbers | D．Large amounts |
It is _________ of him to tell lies, so don’t trust.
| A．normal | B．ordinary | C．common | D．typical |
Mr. Smith is _______ success as a businessman; he takes _______possession of several big companies.
| A．a; the | B．a; / | C．/; a | D．/; the |