Choose the appropriate word to fill the blank.

In the following passage there are blanks, each of which has been numbered. These numbers are printed below the passage and against each five words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case. That is the world we have been living in, and live in today. Nuclear weapons pose a ........... (106) danger of instant destruction, but at least we know in principle how to alleviate the threat, even to eliminate it, an .................... (107) undertaken (and disregarded) by the nuclear powers that have signed the Non-Proliferation Treaty. The threat of global warming is not ..........., (108) though it is .......... (109) in the longer term and might escalate suddenly. That we have the capacity to deal with it is not entirely clear, but there can be no doubt that the longer the delay, the more ........... (110) the calamity.