He has a good command ________ maths and plays an important part ________ our team.
168. Whenever I met him, _____ was fairly frequent, _____ I liked his sweet and hopeful smile.
169. Many newly found old things ______ in the museum this month.
170. Believe in yourself and be _____ you are.
171. She works seven days a week, and six of _____ until one o’clock at night.
172. --- Where did you see him? --- It was in the hotel ______.