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pose assume emerge explore1) It is so difficult to __________ the bottom of the ocean because some parts are very deep.

pose assume emerge explore2）It was about 30 seconds before Alex __________ from the water; we were quite scared.

pose assume emerge explore3) 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.

pose assume emerge explore4)There is widespread concern that the rising unemployment may __________ a threat to social stability.