III. Complete each of the sentences in the following passage with the correct form of the word given in CAPITALS. One of the most lethal poisons on Earth, ten thousand times more deadly than cyanide, is tetrodotoxin, more concisely known as TTX. Its potency is well known in East Asia, where it regularly kills (26. DINE) ______ who have braved the capricious (27. DELICATE) ______ known as puffer fish. This toxin has a (28. TERROR) ______ method of operation: twenty-five minutes after (29. EXPOSE) ______, it begins to paralyse its victims, leaving the victim fully aware of what is happening. Death usually results, within hours, from suffocation or heart failure. There is no known antidote. If lucky patients can (30. STAND) ______ the symptoms for twenty-four hours, they usually recover without further (31. COMPLICATE) ______. It is not an ordinary poison. What is strange about its (32. OCCUR) ______ is that it is found in such a wide range of creatures, from algae to angelfish spanning entire kingdoms of life. It is rather unlikely that such an unusual toxin evolved (33. DEPEND) ______ in so many unrelated animals. Marine biologists have discovered that the poison is produced by bacteria living in the gut of its host. The best explanation is that a symbiotic relationship exists between the host and the (34. WELCOME) ______ guest, where microbes exchange poison for nutrients, providing a valuable (35. DEFEND) ______ weapon for its host.