22. —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 |
Alex and Chris, volunteers from Australia, are said _____ our school as they have finished their teaching mission.
| A．having left | B．leaving |
| C．to leave | D．to have left |
As a student, you’d better learn how to write down notes in class before you _____ them.
| A．forget | B．are forgetting |
| C．forgot | D．will forget |
During the summer vacation, he just stayed at home, doing nothing at all, which _____ his failure in the first monthly examination.
| A．appealed to | B．accounted for |
| C．brought in | D．allowed for |
The world makes _____ for the man who knows where he is going.
| A．method | B．approach |
| C．way | D．means |
It is ____ for me to go to school as it takes only a few minutes to get there.
| A．comfortable | B．suitable |
| C．convenient | D．free |