—I’ve got to go now.—Must you? I ______you could stay for dinner with us.
77. Oh, sorry. A lighted cigarette burned a hole _____ my coat, and I have to change another one.
76. He cut the apple ________, and gave the big to his little sister.
75. Taiji boxing is good _____ health, so the old man began to practise it ten years ago and now he is good _____ it.
74. We went _____ our plan carefully before we carried it out.
73. It is not right _____ a person who is _____ trouble.