228. Oh, the classroom is so dirty. It needs ______ before we begin our class.

215. All Christians(基督徒) insist that there _______ the Lord(上帝) that ___________everything in the universe.

212. We must make sure that all the boxes should__________the owners’ names.

211. Though three football players of the opposite side       to prevent Robert from kicking the ball, he still ______ to shoot the ball into the goal.

192. We were all surprised when he made it clear that he     office soon.

185. Hello! I_______ you _______ in London. How long have you been here?

178. My brother has _____ the army for more than five years.

171. We'll hold a sports meet in our school if it __________ next weekend.

My goodness. How lucky we are! If there had been places for us on that aero-plane, we ________dead now.

Because of climate change, the ice that polar bears depend on for survival       .