Fill in the blanks with the words in the box.poseassumeemergeexplore1. It is so difficult to ________ the bottom of the ocean because some parts are very deep.2. It was about 30 seconds before Alex _________ from the water; we were quite scared.3. We often ________ that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable.4. There is widespread concern that the rising unemployment may _____ a threat to social stability.