Sam: Hey, Maria and John. This Thursday is Bill's birthday. Let's think about the presents. Maria: Sure, Sam. I want to give him a computer game. Sam: No, Bill never plays computer games. John: I want to buy a CD of his favourite songs. Sam: Good idea. Bill likes listening to music. Maria: How about buying a birthday cake for him? Sam: Oh, you don't have to do it. His mother usually buys a birthday cake for him. Maria: How about buying him a cinema ticket? I remember Bill likes watching films. Sam: That sounds a good idea. Maria &John: What about you? What would you like to buy for Bill, Sam? Sam: It's a secret. Bill's birthday is   _  .
this Sunday this Saturday this Friday this Thursday