(2009浙江宁波质检)The building around the corner caught fire last night．The police are now _______ the matter．

More and more trees should be planted in spring to________sandstorms happening frequently. [ ]

We’ll stay at home if it _______ tomorrow.

Is there a flight to Paris this evening? — There ______ be. I’ll phone the airport and find it out. [ ]

The money he spent within a month________more than 1,000 dollars.