Look,here.can you ____ the difference?Sorry,I can't A.Know B

Look,here.can you ____ the difference?Sorry,I can't A.Know B I'm afraid you can't sit here. Sorry,I ___know. A.don't B.di A:Can I [ ]here?B:No,you can't.Can't you see the sign here?A A:Excuse me.Where's the park?B:Sorry,I'm new here.You can as you can't smoke here.look at sign.-sorry,I ( )that Could we smoke here? I'm afraid you ____ A.couldn't B.can't I‘m sorry I don't know,but you can ask them ____ help. I really don't know I can ____ thank you enough.A.hardly B.l look at the sign.you can not pick flowers here!sorry,I ( )it ____.Don't give up.I am sure you can win the game A look out –Can you tell me ____?--Sorry,I don’t know. A：Would you come to the party with me ? B:Sorry,I can’t. A:_