128. We ought to begin ______ the exercise.

78. I shall be angry, if you persist _____ doing that.

80. In order to comply ________ the regulations, please fill in this form.

81. The walls need to be painted. → ______

82. He has drawn ______ his vast experience in writing that book.

130. I ___________ permit that kind of behaviour

127. If I (not wear) navy blue uniforms for twenty years, I might have considered this advice.

91. The house is clean. →