IV. Complete sentences 6. Some one will blow a whistle if there is an emergency. A whistle ......................................................................... 7. They have worked in that factory for ten years. They began .......................................................... 8. The boy is sorry for being late. The boy wishes ................................. 9. Lan hasn’t written to Mary for a month. Lan didn’t .................................................... 10. Both men and women frequently wore the “ ao dai” The “ ao dai” .............................................................. 11. Some beautiful patterns have been added to the “ ao dai” by fashion designers. Fashion designers ........................................................................................................ 12. You should pay your bill before you leave the hotel. Your bill ........................................................................ nhanh mn ơi