4．A．OK，I will．                B．Yes，I think so．        C．Good for you．

3．A．Oh．they are over there．                   B．I'm glad you've found it．

C．Go straight and rum left．

2．A．Certainly you are．                             B．Sure．Hold on，please．

C．I'll do that．

1．A．Yes，please．               B．Good idea．                C．Of course，it is．