The public sign in the library means people ________ smoke there.
could
must
couldn’t
mustn’t
—________ does your father play tennis after work? —Every Tuesday and Thursday.
Just a minute! My brother________ his car in the garden.
—Hurry up , or you ________ catch the train.
Please be ________ .There’s an important meeting in the next room.
The girl in purple is new here, so ________ people know her.