Fill in the gaps with the correct relative pronoun or adverb

Arachnophobia,  [ ] is the fear of spiders, is quite common. People  [ ] suffer from this phobia experience panic attacks  [ ] they see spiders. Their heart rate goes up; they feel dizzy and start to shake. This phobia also interferes with their everyday lives. Arachnophobes check for webs  [ ] they enter a room. They are afraid to open wardrobes, get into the shower and even put on their shoes, places  [ ] spiders love to hide. Luckily, however, there is treatment. Sufferers can slowly confront their fear through pictures. Today, there are even video games with animated spiders  [ ] can help cure the phobia!