The explorers failed to find the cave because it was not locatedthey had expected it to be.

Please _________ the backpack here.

Finding information in today’s world is easy.The ________ is how you can tell if the information you get is useful or not.

The company designed a new car last month andabout 500 cars of this type inthe factory next month

We have finished the work in time __________ your help．So we are very grateful for that．Which of the following is NOT proper?