Alice: Good morning, Bob.
Bob: Good morning, Alice.
Alice: Bob, this is Grace.
Bob: Hi, Grace.
Grace: Hi, Bob.
Alice: Oh, what is that?
Bob: It's my green key.
Alice: What's this?
Bob: It is a ruler.
Alice: Is it your   ruler?
Bob: No. My ruler is red. This ruler is blue.
Alice: Grace, is it your ruler?
Grace: Oh no. It is Frank's ruler.
Alice:40 .
Alice and Bob meet     _  .
in the morning in the afternoon in the evening at night