—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 |
--- When did Lily’s brother finally stop drinking alcohol?
---It was in May ______ he was put into prison for drunk driving.
| A．that | B．since | C．when | D．before |
--What do you think of ________ gifted chemist from London?
---Well, sometimes his behavior is beyond ________ comprehension.
| A．a, the | B．the / | C．the the | D．a / |
visual
| A．measure | B．insurance | C．sugar | D．persuade |
abstract
| A．parent | B．expand | C．acre | D．adjust |
exhaust
| A．exercise | B．exist | C．excuse | D．exhibition |