I didn’t quite follow him because he explained the theory _____that is too abstract for me.
178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
177. You should turn to Mrs. Green. She is the key figure in the company. The underlined part probably means _____.
176. Three times the accused was brought to court for trail, he was sentenced half a year’s imprisonment by the _____.
175. I preferred to go there by plane, but I hadn't enough money to pay for the _______.
174. The teacher asked his students to help the old lady to do some housework and they made a good _____ of it.