81. Their parents make them study fifty new words every week. (MADE) They ________________________________________________________________ 82. It’s sad, but unemployment is unlikely to go down this year. (AS) Sad ________________________________________________________________ 83. Not many scientists managed to find a cure for this infectious disease. (SUCCEEDED) Very ________________________________________________________________ 84. It took the firefighters several hours to extinguish the flames. (OUT) The firefighters ________________________________________________________________ 85. We only became aware of the danger when he warned us. (UNAWARE) But for ________________________________________________________________ 86. Buying a plane ticket at the last minute isn’t often possible. (TO) Rarely ________________________________________________________________ 87. You will never meet anyone more generous than Mrs. Parker. (MOST) Mrs. Parker is ________________________________________________________________ 88. The twins should be able to dress themselves by now. (WERE) It’s high ________________________________________________________________ 89. Why didn’t they tell me about these changes earlier? (SHOULD) I ________________________________________________________________ 90. The brave soldiers were determined to advance to the enemy’s territory. (INTENTION) The brave soldiers had no ________________________________________________________________ (nhanh giúp mình ạ)