1 The ___________ (discover) of a cure for Ebola (埃博拉病毒) was one ofthe big scientific aims of 2014.2 Animals spend much of their life fighting for ___________ (survive).3 The ___________ (migrate) of giant red crabs is one of the most amazingsights.4 Nick is always getting lost because of his terrible sense of ___________(direct).5 Our city is one of the most popular tourist ___________ (destination).