15. Dogs are always faithful …………………. their masters but their masters are sometimes cruel …………….. them A. at; in B. on; by C. to; to D. with; for 16. I don't think that they'll be ……………….. favor of getting the money in the way. A. in B. on C. with D. of 17. While ………. to help Tim with his math, I got impatient because he wouldn't pay attention to what I was staying A l am trying B. having tried C. trying D. tried 18. "Did you tell Carol where ....... us this evening?" "Yes I did. I can't understand why she is late." A should she meet B. she to meet C. she meets D. to meet 19. "Did you enjoy the picnic?" "It was okey, but I'd rather ............. to a movie” A. go B. be going C. have gone D. went