1、Mr.Black used to ( ) a teacher .But now he is a writer.2、You ( ) smoke when you see the sign.1、Mr.Black used to ( ) a teacher .But now he is a writer.2、You ( ) smoke when you see the sign.3、( ) funny story!It makes us laugh again and again.

be cant \shouldnt what a

1、Mr.Black used to ( be ) a teacher .But now he is a writer.
2、You ( can) smoke when you see the sign.
3、( How) funny story! It makes us laugh again and again.

be
can't
What a

1，be
2，shouldn't
3，What a

1.be
2,shouldn·t
3.What a

1、Mr.Black used to (be ) a teacher .But now he is a writer.2、You (can't//are not allowed to ) smoke when you see the sign. 3、(What a ) funny story! It makes us laugh again and again.