If prices rise too high, the government has to do something _________ it. 

 I ____ have been there, but I ____ not find the time.

---Where is Tom?        ---He hasn’t come to school today. I think he        be ill.

— _______ we clean the classroom at once?  — No, you _______. You _______ clean it after school. 

 — The socks must be Linda’s.— No, they         be. They’re too small for her.