---Whose book is this? ---It ______ be Linda’s. It has her name on it.
---Look! It must be Jack on the playground.---It _____ be him. Because I saw him enter the school library just now.
---Have you found the information about the famous people ______ you can use for the report?---Not yet. I’ll search some on the Internet.
---Did you go to Tom’s twelfth birthday party last Sunday?--- No, I ________ .
In some foreign countries, such as Canada, children usually leave their parents when they grow up. It makes the old feel_______.
---What ______ do you have for Paul?---I think he should study harder than before.