Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers.

Guest: ______.

Clerk: Certainly. Do you have a reservation?

Guest: Yes. The name is Morales. Mr. and Mrs. Morales.

Clerk: Here we are. For five nights. Could you fill in the registration card, please? And I'll need your credit card.

Susan: I'm going to the cinema this evening.

Gordon: ______ ?

Susan: It's a Western: "Cowboy Comes Home".

Customer: ______ if you'd serve me as quickly as possible as I've got an appointment at two fifteen.

Waiter: I'll do my best, Madam.

Conversation between two strangers at a party.

Chester: Hello, I'm Brian Chester. Let me get you some more to drink.

Jackson: Not at the moment, thank you.

Guest: Have you a single room for tonight and tomorrow night with a telephone and shower?

Clerk: We haven't any rooms with a shower free just now, but there's a bathroom available on each floor.

Guest: ______ 

Elizabeth (Treading on someone's foot. ): ______ . I hope I haven't hurt you.

Jordan: It's all fight.

Telephone enquiry Clerk: Lost property department. Can I help you?

Phone caller: ______ I left it on the "Margate Mermaid" when we cross from Olsten Yesterday morning.

Speaker A: Did you have a good crossing?

Speaker B: ______. It was really rough and I'm not a good sailor.

Bob: Can I help with your luggage?

Mary: ______

Speaker A: Are you feeling better now?

Speaker B: ______