Thank you for your timely help; otherwise we _______ in great trouble now.

— Did you see a man in black pass by just now?
— No, sir. I _______ a newspaper.

A professor of biology gave a talk to more than 1000 students on elephants living conditions and the dangers _______ them. 

My car ______ down just when I need it most. I have to get it repaired. 

Next month various methods __________ to help the patient’s hand get strong.

I suggest they _______ at once.
A. setting off  B .to set off  C. set off  D have set off

---When shall we start the reconstruction of the historic building?
--- Not until our program ______ by the authority.

—Excuse me, Madam．Taking photos is forbidden here out of security．
—I’m really sorry, I _______ of that．

While the police have already done a lot of investigation, much evidence ___   __.