It’s the fourth time that heavy smog has hit the city this month. — It’s high time we _______ measures tofight air pollution.

. The book, _______ is blue, is mine.

It was clear that he was ______ the people he owed money to[ ]

r cup of tea That’s your third sincelunch. —-Yeah, well, I ____ all night preparing for myhistory exam. I can hardly keep my eyes open.

You didn’t sleep well last night, didyou— , soI feel tired now.