---I’m afraid I must be off now .
--- ____________________ .
| A．No problem | B．Never mind | C．Step slowly | D．See you soon. |
Children under 12 years of age in that country _____ be under adult supervision when in a public library.
| A．must | B．may | C．can | D．need |
--- Isn't that Ann's husband over there?
--- No, it ______ be him---I'm sure he doesn't wear glasses.
| A．can't | B．must not | C．won't | D．may not |
Mr White____at 8:30 for the meeting, but he didn't show up.
| A．should have arrived | B．should arrive | C．should have had arrived | D．should be arriving |
I often see lights in that empty house. Do you think I ______ report it to the police?
| A．should | B．may | C．will | D．can |
--- I don't mind telling you what I know.
--- You ______. I'm not asking you for it.
| A．mustn't | B．may not | C．can't | D．needn't |