根据所给的汉语写出单词，使句子意思完整正确。
51. We should develop ▲ (现代的) services and tourism in our country.
52. Don’t lose ▲ (勇气) whenever you are in trouble.
53. Although Zhou Dongyu is a new actress, she ▲ (表演) very well.
54. Mr Green won’t mind ▲ (留出) you two hours tomorrow morning.
55. It’s bad for your health to go to school ▲ (没有) breakfast every morning.
56. Look at the sign！We are not ▲ (允许) to park cars here.
57. It is ▲ (不可能) for her to finish the work in half an hour.