give up      with one's help      as long as     great      get lost      work out

71．I think mother's love is the 　　in the world．

72．If you 　　in the city，you'd better ask the police for help．

73． 　　I get something good，I will share it with my friends．

74．Never 　　，you will achieve your dream．

75．Jack is smart， 　　，I finished my work on time．