After the operation, Bill has been doing a lot of physical exercise to build up his _____.

We had planned to climb the hill this morning, but the heavy rain _____ our plan.

— Is it true that Jack _______?—Exactly. He damaged a very expensive machine.

(2013·陕西高考)The witnesses ________ by the police just now gave very different descriptions of the fight.

With inspiration from other food cultures，American food culture can take a________for the better.                                                            (2013·江苏，33)