Add a missing word to each sentence. 1 Unfortunately, we cancelled the trip because half of down the class came with the flu. 2 I take a lot of vitamin C to fight infections. 3 You can't eat this cake if you're allergic nuts. 4 I came home feeling unwell, so I took aspirin and went to bed. 5 I've got a really bad toothache, and I must make appointment with my dentist right away.​