19. She’s going to look for a job as soon as she arrives (arrive) in London.
原因:as soon as的意思是“当”,所以在这个句子as soon as的前面的动词是present tense,后面也一定是present tense
22. Take your umbrella. It will rain @ is going to rain (rain) when you return.
原因:will和is going to的意思是一样的,都是“即将”的意思